Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, depth rasters, and coastal surge layer were created to provide an estimated extent of flood inundation in Coastal basins including East and West Matagorda Bay Subbasins, East and West San Antonio Bay Subbasins, and Aransas Bay Subbasin, Texas. The mapped area of the Coastal basins were separated into three sections based on the availability and location of high-water marks. The maps of the eastern part of the East Matagorda Bay Subbasin include a 17-mi reach of Peyton Creek and a 16-mi reach of Big Boggy Creek, and flood-inundation map for 6-mi reach of Little Boggy Creek in Matagorda County. The maps of the western part of East Matagorda Bay Subbasin include a 13.5-mi reach of West Carancahua Creek, 14.5-mi reach of East Carancahua Creek, and 9.6-mi reach of Keller Creek within Matagorda, Jackson, and Calhoun Counties. The maps of the middle part of the East Matagorda Bay Subbasin are for a 21-mi reach of the Tres Palacios River within Matagorda County. These geospatial data include the following items: 1. bnd_emb1, bnd_emb2, and bnd_tres_palacios; shapefiles containing the polygon showing the mapped area boundary for the Coastal basins flood maps, 2. hwm_emb_1, hwm_emb2, and hwm_tres_palacios; shapefiles containing high-water mark points used for inundation maps, 3. polygon_emb1, polygon_emb_2, and polygon_tres_palacios; shapefiles containing mapped extent of flood inundation for the Coastal basins, derived from the water-surface elevation surveyed at high-water marks, 4. depth_emb1, depth_emb2, and depth_tres; raster files for the flood depths derived from the water-surface elevation surveyed at high-water marks, and 5. coastal_surge.lyr; a layer file generated from the depth raster depicting water height above ground recorded at the high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012). The HWM elevation data from the USGS Short-tern Network (STN) was used to create the flood water-surface raster file (U.S. Geological Survey [USGS], 2018, Short-Term Network Data Portal: USGS flood information web page, accessed February 13, 2018, at https://water.usgs.gov/floods/FEV.). The water-surface raster was the basis for the creation of the final flood inundation polygon and depth layer to support the development of flood inundation map for the Federal Emergency Management Agency's (FEMA) response and recovery operations.

Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, and depth rasters were created to provide an estimated extent of flood inundation along the Sabine River and tributaries within the communities in Jasper, Newton, Orange, and Jefferson Counties, Texas, and Beauregard, Calcasieu, and Cameron Parishes, Louisiana. The mapped area of the Sabine Basin was separated into three sections due to the availability and location of high-water marks; upper, middle, and lower. Selected tributaries to the Sabine, Big Cow Creek and Cow Bayou were also mapped. These geospatial data include the following items: 1. bnd_sabine_upper, bnd_sabine_middle, bnd_sabine_lower, bnd_bigcowcreek, bnd_cowbayou; shapefiles containing the polygon showing the mapped area boundary for the upper, middle, and lower Sabine River, Big Cow Creek, and Cow Bayou flood maps, 2. hwm_sabine_upper, hwm_ sabine _middle, hwm_ sabine _lower, hwm_bigcowcreek, and hwm_cowbayou; shapefiles containing high-water mark points used for inundation maps, 3. polygon_ sabine _upper, polygon_ sabine _middle, polygon_ sabine _lower, polygon_bigcowcreek, and polygon_cowbayou; shapefiles containing mapped extent of flood inundation for the upper, middle, and lower Sabine River, Big Cow Creek, and Cow Bayou, derived from the water-surface elevation surveyed at high-water marks, and 4. depth_upper, depth_middle, depth_lower, depth_bigcow, and depth_cow; raster files for the flood depths derived from the water-surface elevation surveyed at high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012). These data show the area of inundation within communities along the Sabine River and tributaries in Texas. The polygon shapefiles were created to provide an extent of flood inundation along the Sabine River and tributaries within communities in Newton, Orange, and Jefferson Counties, Texas, and Beauregard, Calcasieu, and Cameron Parishes, Louisiana. The HWM elevation data from the USGS Short-tern Network (STN) was used to create the flood water-surface raster file (U.S. Geological Survey [USGS], 2018, Short-Term Network Data Portal: USGS flood information web page, accessed February 13, 2018, at https://water.usgs.gov/floods/FEV.). The water-surface raster was the basis for the creation of the final flood inundation polygon and depth layer to support the development of flood inundation map for the Federal Emergency Management Agency's (FEMA) response and recovery operations.

Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, and depth rasters were created to provide an estimated extent of flood inundation along the Neches River within counties of Orange, Jasper, Hardin, Jefferson, and Tyler, including the communities of Beaumont, Evadale, Port Neches, and Central Gardens, Texas. The mapped area of the Neches Basin was separated into two sections due to the availability and location of high-water marks. The upper reach of the Neches River extends from near the confluence with the Angelina River to the confluence of Black Creek in the Big Thicket National Preserve. The lower reach of the Neches River extends from the confluence of Black Creek in the Big Thicket National Preserve to Sabine Lake. These geospatial data include the following items: 1. bnd_neches_upper and bnd_neches_lower; shapefiles containing the polygon showing the mapped area boundary for the upper and lower Neches River flood maps, 2. hwm_neches_upper and hwm_neches_lower; shapefiles containing high-water mark points used for inundation maps, 3. polygon_neches_upper and polygon_neches_lower; shapefiles containing mapped extent of flood inundation for the upper and lower mapped sections of the Neches River, derived from the water-surface elevation surveyed at high-water marks, and 4. depth_upper and depth_lower; raster files for the flood depths derived from the water-surface elevation surveyed at high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012). These data show the area of inundation within communities along the Neches River, Texas. The HWM elevation data from the USGS Short-tern Network (STN) was used to create the flood water-surface raster file (U.S. Geological Survey [USGS], 2018, Short-Term Network Data Portal: USGS flood information web page, accessed February 13, 2018, at https://water.usgs.gov/floods/FEV.). The water-surface raster was the basis for the creation of the final flood inundation polygon and depth layer to support the development of flood inundation map for the Federal Emergency Management Agency's (FEMA) response and recovery operations.

Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, and depth rasters were created to provide an estimated extent of flood inundation along the Neches River within counties of Orange, Jasper, Hardin, Jefferson, and Tyler, including the communities of Beaumont, Evadale, Port Neches, and Central Gardens, Texas. The mapped area of the Neches Basin was separated into two sections due to the availability and location of high-water marks. The upper reach of the Neches River extends from near the confluence with the Angelina River to the confluence of Black Creek in the Big Thicket National Preserve. The lower reach of the Neches River extends from the confluence of Black Creek in the Big Thicket National Preserve to Sabine Lake. These geospatial data include the following items: 1. bnd_neches_upper and bnd_neches_lower; shapefiles containing the polygon showing the mapped area boundary for the upper and lower Neches River flood maps, 2. hwm_neches_upper and hwm_neches_lower; shapefiles containing high-water mark points used for inundation maps, 3. polygon_neches_upper and polygon_neches_lower; shapefiles containing mapped extent of flood inundation for the upper and lower mapped sections of the Neches River, derived from the water-surface elevation surveyed at high-water marks, and 4. depth_upper and depth_lower; raster files for the flood depths derived from the water-surface elevation surveyed at high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012). These data show the area of inundation within communities along the Neches River, Texas. The HWM elevation data from the USGS Short-tern Network (STN) was used to create the flood water-surface raster file (U.S. Geological Survey [USGS], 2018, Short-Term Network Data Portal: USGS flood information web page, accessed February 13, 2018, at https://water.usgs.gov/floods/FEV.). The water-surface raster was the basis for the creation of the final flood inundation polygon and depth layer to support the development of flood inundation map for the Federal Emergency Management Agency's (FEMA) response and recovery operations.

Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, and depth rasters were created to provide an estimated extent of flood inundation along the Brazos River. The mapped area of the Brazos Basin was separated into two sections due to the availability and location of high-water marks; upper and lower. The upper-reach inundation map includes 99-miles of the main stem of the Brazos River from Burleigh, Texas downstream to Thompsons, Texas. The upper-reach inundation map also includes a 43-mile reach of Bessies Creek beginning upstream from Pattison, Texas to the confluence with the Brazos River near Fulshear, Texas, and a 9-mile reach of Mill Creek from USGS streamflow-gaging station 08111700 Mill Creek near Bellville, Texas to the confluence with the Brazos River. Communities along the upper reach include San Felipe, Wallis, Brazos Country, Simonton, Weston Lakes, Rosenberg, Richmond, Sugar Land, and Booth, Texas, covering parts of Waller, Austin, and Fort Bend counties. The lower reach inundation map is for a 20-mile reach of the main stem of the Brazos River from Holiday Lakes, Texas to just upstream from Lake Jackson, Texas. Communities along the lower reach include the following communities in Brazoria County: West Columbia, East Columbia, Bailey’s Prairie, Brazoria, and Lake Jackson, Texas. These geospatial data include the following items: 1. bnd_brazos_upper and bnd_brazos_lower; shapefiles containing the polygon showing the mapped area boundary for the upper and lower Brazos River flood maps, 2. hwm_brazos_upper and hwm_ brazos _lower; shapefiles containing high-water mark points used for inundation maps, 3. polygon_ brazos_upper and polygon_ brazos _lower; shapefiles containing mapped extent of flood inundation for the upper and lower mapped sections of the Brazos River, derived from the water-surface elevation surveyed at high-water marks, and 4. depth_upper and depth_lower; raster files for the flood depths derived from the water-surface elevation surveyed at high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012).

Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, and depth rasters were created to provide an estimated extent of flood inundation along the Brazos River. The mapped area of the Brazos Basin was separated into two sections due to the availability and location of high-water marks; upper and lower. The upper-reach inundation map includes 99-miles of the main stem of the Brazos River from Burleigh, Texas downstream to Thompsons, Texas. The upper-reach inundation map also includes a 43-mile reach of Bessies Creek beginning upstream from Pattison, Texas to the confluence with the Brazos River near Fulshear, Texas, and a 9-mile reach of Mill Creek from USGS streamflow-gaging station 08111700 Mill Creek near Bellville, Texas to the confluence with the Brazos River. Communities along the upper reach include San Felipe, Wallis, Brazos Country, Simonton, Weston Lakes, Rosenberg, Richmond, Sugar Land, and Booth, Texas, covering parts of Waller, Austin, and Fort Bend counties. The lower reach inundation map is for a 20-mile reach of the main stem of the Brazos River from Holiday Lakes, Texas to just upstream from Lake Jackson, Texas. Communities along the lower reach include the following communities in Brazoria County: West Columbia, East Columbia, Bailey’s Prairie, Brazoria, and Lake Jackson, Texas. These geospatial data include the following items: 1. bnd_brazos_upper and bnd_brazos_lower; shapefiles containing the polygon showing the mapped area boundary for the upper and lower Brazos River flood maps, 2. hwm_brazos_upper and hwm_ brazos _lower; shapefiles containing high-water mark points used for inundation maps, 3. polygon_ brazos_upper and polygon_ brazos _lower; shapefiles containing mapped extent of flood inundation for the upper and lower mapped sections of the Brazos River, derived from the water-surface elevation surveyed at high-water marks, and 4. depth_upper and depth_lower; raster files for the flood depths derived from the water-surface elevation surveyed at high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012).

Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, and depth rasters were created to provide an estimated extent of flood inundation along the West Fork San Jacinto River and East Fork San Jacinto River within counties of Grimes and Walker, Texas. The mapped area of the San Jacinto Basin and tributaries were separated into two sections due to the availability and location of high-water marks for the West Fork San Jacinto River and East Fork San Jacinto River. The inundation map of the West Fork San Jacinto River is a 36-mi reach of the main stem of San Jacinto River near Conroe, Tex. and includes Cypress Creek (53-mi reach), Little Cypress Creek (21-mi reach), Willow Creek (6-mi reach), Spring Creek (68-mi reach), Walnut Creek (15-mi reach), Panther Branch (11-mi reach), Lake Creek (7-mi reach), and Crystal Creek (2-mi reach). The inundation map of the East Fork San Jacinto River is a 65-mi reach of the main stem of the San Jacinto River near Coldspring, Tex. and includes White Oak Creek (9-mi reach), Caney Creek (31-mi reach), Peach Creek (19-mi reach), Winters Bayou (33-mi reach), and Luce Bayou (9-mile reach). The 18-mi reach of the San Jacinto River from the confluence of the west and east forks to the Lake Houston Dam near Shelton, Tex. is also included in the inundation map. These geospatial data include the following items: 1. bnd_west and bnd_east; shapefiles containing the polygon showing the mapped area boundary for the West Fork and East Fork San Jacinto River flood maps, 2. hwm_west and hwm_east; shapefiles containing high-water mark points used for inundation maps, 3. polygon_west and polygon_east; shapefiles containing mapped extent of flood inundation for the West Fork and East Fork mapped sections of the San Jacinto River, derived from the water-surface elevation surveyed at high-water marks, and 4. depth_west and depth_east; raster files for the flood depths derived from the water-surface elevation surveyed at high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012). The HWM elevation data from the USGS Short-tern Network (STN) was used to create the flood water-surface raster file (U.S. Geological Survey [USGS], 2018, Short-Term Network Data Portal: USGS flood information web page, accessed February 13, 2018, at https://water.usgs.gov/floods/FEV.). The water-surface raster was the basis for the creation of the final flood inundation polygon and depth layer to support the development of flood inundation map for the Federal Emergency Management Agency's (FEMA) response and recovery operations.

Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, and depth rasters were created to provide an estimated extent of flood inundation along the West Fork San Jacinto River and East Fork San Jacinto River within counties of Grimes and Walker, Texas. The mapped area of the San Jacinto Basin and tributaries were separated into two sections due to the availability and location of high-water marks for the West Fork San Jacinto River and East Fork San Jacinto River. The inundation map of the West Fork San Jacinto River is a 36-mi reach of the main stem of San Jacinto River near Conroe, Tex. and includes Cypress Creek (53-mi reach), Little Cypress Creek (21-mi reach), Willow Creek (6-mi reach), Spring Creek (68-mi reach), Walnut Creek (15-mi reach), Panther Branch (11-mi reach), Lake Creek (7-mi reach), and Crystal Creek (2-mi reach). The inundation map of the East Fork San Jacinto River is a 65-mi reach of the main stem of the San Jacinto River near Coldspring, Tex. and includes White Oak Creek (9-mi reach), Caney Creek (31-mi reach), Peach Creek (19-mi reach), Winters Bayou (33-mi reach), and Luce Bayou (9-mile reach). The 18-mi reach of the San Jacinto River from the confluence of the west and east forks to the Lake Houston Dam near Shelton, Tex. is also included in the inundation map. These geospatial data include the following items: 1. bnd_west and bnd_east; shapefiles containing the polygon showing the mapped area boundary for the West Fork and East Fork San Jacinto River flood maps, 2. hwm_west and hwm_east; shapefiles containing high-water mark points used for inundation maps, 3. polygon_west and polygon_east; shapefiles containing mapped extent of flood inundation for the West Fork and East Fork mapped sections of the San Jacinto River, derived from the water-surface elevation surveyed at high-water marks, and 4. depth_west and depth_east; raster files for the flood depths derived from the water-surface elevation surveyed at high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012). The HWM elevation data from the USGS Short-tern Network (STN) was used to create the flood water-surface raster file (U.S. Geological Survey [USGS], 2018, Short-Term Network Data Portal: USGS flood information web page, accessed February 13, 2018, at https://water.usgs.gov/floods/FEV.). The water-surface raster was the basis for the creation of the final flood inundation polygon and depth layer to support the development of flood inundation map for the Federal Emergency Management Agency's (FEMA) response and recovery operations.

Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, and depth rasters were created to provide an estimated extent of flood inundation along the Pine Island Bayou within the communities of Hull, Daisetta, Sour Lake, Nome, Bevil Oaks, Rose Hill Acres, and the outskirts of Beaumont, Texas. These geospatial data include the following items: 1. bnd_pib; shapefile containing the polygon showing the mapped area boundary for the Pine Island Bayou flood maps, 2. hwm_pib; shapefile containing high-water mark points, 3. polygon_pib; shapefile containing mapped extent of flood inundation, derived from the water-surface elevation surveyed at high-water marks, and 4. depth_pib; raster file for the flood depths derived from the water-surface elevation surveyed at high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012). These data show the area of inundation within communities along the Pine Island Bayou, Texas. This polygon shapefile was created to provide an extent of flood inundation along the Pine Island Bayou within communities in the counties of Jefferson, Hardin, Liberty, and Orange, Texas. The extent of the inundation map is a 68-mi reach of Pine Island Bayou through the communities of Hull, Daisetta, Sour Lake, Nome, Bevil Oaks, Rose Hill Acres, and the outskirts of Beaumont. The HWM elevation data from the USGS Short-tern Network (STN) was used to create the flood water-surface raster file (U.S. Geological Survey [USGS], 2018, Short-Term Network Data Portal: USGS flood information web page, accessed February 13, 2018, at https://water.usgs.gov/floods/FEV.). The water-surface raster was the basis for the creation of the final flood inundation polygon and depth layer to support the development of flood inundation map for the Federal Emergency Management Agency's (FEMA) response and recovery operations.

The basis for these features is U.S. Geological Survey Scientific Investigation Report 2017-5024 Flood Inundation Mapping Data for Johnson Creek near Sycamore, Oregon. The domain of the HEC-RAS hydraulic model is a 12.9 mile reach of Johnson Creek from just upstream of SE 174th Avenue in Portland, Oregon to its confluence with the Willamette River. Some of the hydraulics used in the model were taken from Federal Emergency Management Agency, 2010, Flood Insurance Study, City of Portland, Oregon, Multnomah, Clackamas and Washington Counties, Volume 1 of 3, November 26, 2010. The Digital Elevation Model (DEM) utilized for the project was developed from LiDAR data flown in 2015 and provided by the Oregon Department of Geology and Mineral Industries. Bridge decks are generally removed from DEMs as standard practice. Therefore, these features may be shown as inundated when they are not. Judgement should be used when estimating the usefulness of a bridge during flood flow. Comparing the bridge to the surrounding ground can be more informative in this respect than simply looking at the bridge itself. Two model plans were used in the creation of the flood layers. The first is a stable model plan using unsteady flow in which the maximum streamflow is held in place for a long period of time (a number of days) in order to replicate a steady model using an unsteady plan. The stable model plan produced the areas of uncertainty contained in the sycor_breach.shp shapefile. The second is an unstable model plan that uses unsteady flow in which the full hydrograph (rising and falling limb) is represented based on the hydrograph shape of the December 2015 peak annual flood. The unstable model plan produced the flood extent polygons contained in the sycor.shp shapefile and the depth rasters and represents the best estimate of flood inundation for the given streamflow at U.S. Geological Survey streamgage 14211500.