Seventeen streamflow-gaging stations, operated by the U.S. Geological Survey and distributed across the Ouachita Mountains of Arkansas and Oklahoma were selected for analysis. Regional hydraulic geometry curves relating drainage area to bankfull dimensions: cross-sectional area, top width, mean depth, and discharge, were developed from data collected at the selected streamflow-gaging stations. Bed material sampling was conducted to obtain information on the particle-size distributions of the streambed materials and to determine the shapes of the individual particles comprising the streambeds. The stream reaches at each streamflow-gaging station were classified using the Rosgen level II stream type (Rosgen, 1996) based on the average of stream channel metrics collected from site cross-sections and profiles. Descriptions of selected stream reaches are presented in the attached Comma-Separated Values (CSV) file. Descriptions for each site include the reach beginning and ending locations, the geology and soils at the reach, the land cover within the watershed, the streambed substrate type from the riffle cross sections within the reach, the entrenchment ratio, width-to-depth ratio, and sinuosity for the reach, the observed reach morphology, and the stream-type classification for the reach. Photos of selected stream reaches were obtained to document site conditions at the time of data collection. Approximately 350 photos are archived here in 15 zipped files, one for each study site. Each study site’s zipped file contains photo JPG files for that site and a CSV file listing the following photo attributes; 1) the photo file name, 2) the USGS streamflow gaging station number, 3) the USGS streamflow gaging station name, 4) the date the photo was taken, and 5) a description of the photo view. Note: Unfortunately, over the decade since much of the field work for this study was completed, some photos have been lost; including all of the photos for two sites (Rock Creek near Dierks, Ark and Alum Fork Saline River near Reform, Ark). References Rosgen, D.L., 1996, Applied river morphology: Pagosa Springs, Colorado, Wildland Hydrology Books, 390 p. This child item contains site information and photos for the 17 study sites including: 1) Summary table of site information (CSV file). 2) Table of descriptions of selected stream-reaches (CSV file). 3) Zipped file of photos from selected stream-reaches (JPG and CSV files).

Seventeen streamflow-gageing stations, operated by the U.S. Geological Survey and distributed across the Ouachita Mountains of Arkansas and Oklahoma were selected for analysis. This child item includes a geographic information system polygon shapefile of the watersheds delineated above the study site locations. (OuachitaWatersheds)

Seventeen streamflow-gageing stations, operated by the U.S. Geological Survey and distributed across the Ouachita Mountains of Arkansas and Oklahoma were selected for analysis. This child item includes a geographic information system polygon shapefile of the watersheds delineated above the study site locations. (OuachitaWatersheds)

Seventeen streamflow-gaging stations, operated by the U.S. Geological Survey and distributed across the Ouachita Mountains of Arkansas and Oklahoma were selected for analysis. This child item includes a geographic information system point shapefiles of the study site locations. (OuachitaUsgsGages)

Seventeen streamflow-gaging stations, operated by the U.S. Geological Survey and distributed across the Ouachita Mountains of Arkansas and Oklahoma were selected for analysis. This child item includes a geographic information system point shapefiles of the study site locations. (OuachitaUsgsGages)

Seventeen streamflow-gaging stations, operated by the U.S. Geological Survey and distributed across the Ouachita Mountains of Arkansas and Oklahoma were selected for analysis. Bed material sampling was conducted to obtain information on the particle-size distributions of the streambed materials and to determine the shapes of the individual particles comprising the streambeds. Information on stream-bed particle-size distribution was used to compute the potential rate of bed-load transport and is a parameter used in the Rosgen (Rosgen, 1996) stream reach classification system. Streambed-material particle sizes were measured using two methods. The first method was Wolman pebble counts conducted across the riffles and pools within each study reach. A step-toe procedure was used to collect approximately 100 samples at each riffle and pool. Materials only from the active streambed were measured. For each sample the longest (A) axis, intermediate (B) axis, and shortest (C) axis were measured and recorded. From this pebble count data the bedrock tallies were removed and cumulative frequency curves were developed, from which the median (D50) and one standard deviation from the median (D16 and D84) particle sizes were determined. Bedrock is defined as any exposure of native solid rock in the streambed or along the streambanks. The second streambed-material particle-size sampling method was a sieve analysis of bar samples. A 5-gallon pail (approximately 50 – 60 lbs) of bar gravel was collected from the downstream face of a point-bar approximately 1/3 of the way down the face. The sample was dried and weighed to the nearest 0.1 of a gram to determine the total sample weight. The sample was then placed in a nest of sieves and a mechanical sieve shaker was used to shake the sample particles through the sieves. Next, the particles from each sieve were removed and weighed. The final total weights retained on each sieve were summed and compared to the original total weight before sieving. From the weight retained on each sieve cumulative frequency curves were developed, the median (D50) and one standard deviation from the median (D16 and D84) particles sizes were determined. References Rosgen, D.L., 1996, Applied river morphology: Pagosa Springs, Colorado, Wildland Hydrology Books, 390 p. This child item contains particle information for the 17 study sites. The data for each site is in a zipped file including: 1) Tables with study site Wolman pebble and bar measurements (CSV files). 2) Graphs of streambed particle size cumulative frequency curves and particle shape analysis (JPG files).

Seventeen streamflow-gaging stations, operated by the U.S. Geological Survey and distributed across the Ouachita Mountains of Arkansas and Oklahoma were selected for analysis. Bed material sampling was conducted to obtain information on the particle-size distributions of the streambed materials and to determine the shapes of the individual particles comprising the streambeds. Information on stream-bed particle-size distribution was used to compute the potential rate of bed-load transport and is a parameter used in the Rosgen (Rosgen, 1996) stream reach classification system. Streambed-material particle sizes were measured using two methods. The first method was Wolman pebble counts conducted across the riffles and pools within each study reach. A step-toe procedure was used to collect approximately 100 samples at each riffle and pool. Materials only from the active streambed were measured. For each sample the longest (A) axis, intermediate (B) axis, and shortest (C) axis were measured and recorded. From this pebble count data the bedrock tallies were removed and cumulative frequency curves were developed, from which the median (D50) and one standard deviation from the median (D16 and D84) particle sizes were determined. Bedrock is defined as any exposure of native solid rock in the streambed or along the streambanks. The second streambed-material particle-size sampling method was a sieve analysis of bar samples. A 5-gallon pail (approximately 50 – 60 lbs) of bar gravel was collected from the downstream face of a point-bar approximately 1/3 of the way down the face. The sample was dried and weighed to the nearest 0.1 of a gram to determine the total sample weight. The sample was then placed in a nest of sieves and a mechanical sieve shaker was used to shake the sample particles through the sieves. Next, the particles from each sieve were removed and weighed. The final total weights retained on each sieve were summed and compared to the original total weight before sieving. From the weight retained on each sieve cumulative frequency curves were developed, the median (D50) and one standard deviation from the median (D16 and D84) particles sizes were determined. References Rosgen, D.L., 1996, Applied river morphology: Pagosa Springs, Colorado, Wildland Hydrology Books, 390 p. This child item contains particle information for the 17 study sites. The data for each site is in a zipped file including: 1) Tables with study site Wolman pebble and bar measurements (CSV files). 2) Graphs of streambed particle size cumulative frequency curves and particle shape analysis (JPG files).

5 aerial photographs were taken along the Little Missouri River in 1995. All images were geo-referenced to the 1995 digital orthophoto quarter quadrangles as described by Miller and Friedman (2009). Both the flood plain and active channel of the river were delineated on the 1995 digital orthophoto quadrangles and overlaid on rectified photos. ArcGIS was used to draw the polygons that delineate the flood plain and active channel; the delineation was saved as a SHP file. The separate images (geoTIFFs) can be viewed as a composite along with that year's channel delineation (SHP file) using a geographic information system (GIS) application. Reference: Miller, J.R., and J.M. Friedman. 2009. Influence of flow variability on flood-plain formation and destruction, Little Missouri River, North Dakota. Geological Society of America Bulletin 121:752-759.

5 aerial photographs were taken along the Little Missouri River in 1995. All images were geo-referenced to the 1995 digital orthophoto quarter quadrangles as described by Miller and Friedman (2009). Both the flood plain and active channel of the river were delineated on the 1995 digital orthophoto quadrangles and overlaid on rectified photos. ArcGIS was used to draw the polygons that delineate the flood plain and active channel; the delineation was saved as a SHP file. The separate images (geoTIFFs) can be viewed as a composite along with that year's channel delineation (SHP file) using a geographic information system (GIS) application. Reference: Miller, J.R., and J.M. Friedman. 2009. Influence of flow variability on flood-plain formation and destruction, Little Missouri River, North Dakota. Geological Society of America Bulletin 121:752-759.

4 aerial photographs were taken along the Little Missouri River in 1974. All images were geo-referenced to the 1995 digital orthophoto quarter quadrangles as described by Miller and Friedman (2009). Both the flood plain and active channel of the river were delineated on the 1995 digital orthophoto quadrangles and overlaid on rectified photos. ArcGIS was used to draw the polygons that delineate the flood plain and active channel; the delineation was saved as a SHP file. The separate images (geoTIFFs) can be viewed as a composite along with that year's channel delineation (SHP file) using a geographic information system (GIS) application. Reference: Miller, J.R., and J.M. Friedman. 2009. Influence of flow variability on flood-plain formation and destruction, Little Missouri River, North Dakota. Geological Society of America Bulletin 121:752-759.