This data release will consist of 40 Excel files (one file for each cross section) containing worksheets corresponding to each channel cross-section survey (from 2 to about 40). Worksheets contain the basic survey data (dates, equipment, reference elevations, foresights, distances from reference pins, and elevations).

This data release consist of the annual sediment depositional volume at five floodplain and five point bar sites on Powder River in southeastern Montana from 1979 through 2017. These 10 sites are a subgroup of a larger group of cross-sections established in 1975 and 1977 to monitor the channel changes along a 90-kilometer reach of Powder River. In addition to the sediment deposition data, characteristic of the annual peak flood are listed. The data are in 1 Excel files containing worksheets (10) corresponding to each channel cross-section .

The Middle Fork Willamette River Basin encompasses 3,548 square kilometers of western Oregon and drains to the mainstem Willamette River. Fall Creek Basin encompasses 653 square kilometers and drains to the Middle Fork Willamette River. In cooperation with the U.S. Army Corps of Engineers, the U.S. Geological Survey evaluated geomorphic responses of downstream river corridors to annual drawdowns to streambed at Fall Creek Lake. This study of geomorphic change is focused on the major alluvial channel segments downstream of the U.S. Army Corps of Engineers dams including the lowermost 11.5 km of Fall Creek and 27.3 km of the Middle Fork Willamette River, as well as Fall Creek Lake. This dataset is delivered as one excel workbook with two tabs, and associated metadata includes separate entity sections for each workbook tab. These tables document grain-size distributions and sediment depths collected as a part of a study to document the geomorphic responses to the Fall Creek Lake streambed drawdowns. Surficial grain size distributions and fine sediment deposit depths were measured for this study over 2015 through 2017 to support analyses tracking geomorphic change in the reaches downstream of Fall Creek Lake. Particle counts were collected at 6 gravel bars along Fall Creek and the Middle Fork Willamette River in September 2015. Counts were repeated at 5 of those sites and at 5 additional sites along the Middle Fork Willamette River in October 2016. Multiple clay horizon markers were deployed at 10 sites in October 2015. Deposition depths were measured multiple times throughout the year. Clay horizon markers were deployed again at 9 of the 2015 sites plus one additional site in October-November 2016 and, again, measured throughout the year. Sediment measurements are summarized in spreadsheet tables.

The Middle Fork Willamette River Basin encompasses 3,548 square kilometers of western Oregon and drains to the mainstem Willamette River. Fall Creek Basin encompasses 653 square kilometers and drains to the Middle Fork Willamette River. In cooperation with the U.S. Army Corps of Engineers, the U.S. Geological Survey evaluated geomorphic responses of downstream river corridors to annual drawdowns to streambed at Fall Creek Lake. This study of geomorphic change is focused on the major alluvial channel segments downstream of the U.S. Army Corps of Engineers dams including the lowermost 11.5 km of Fall Creek and 27.3 km of the Middle Fork Willamette River, as well as Fall Creek Lake. This dataset is delivered as one excel workbook with two tabs, and associated metadata includes separate entity sections for each workbook tab. These tables document grain-size distributions and sediment depths collected as a part of a study to document the geomorphic responses to the Fall Creek Lake streambed drawdowns. Surficial grain size distributions and fine sediment deposit depths were measured for this study over 2015 through 2017 to support analyses tracking geomorphic change in the reaches downstream of Fall Creek Lake. Particle counts were collected at 6 gravel bars along Fall Creek and the Middle Fork Willamette River in September 2015. Counts were repeated at 5 of those sites and at 5 additional sites along the Middle Fork Willamette River in October 2016. Multiple clay horizon markers were deployed at 10 sites in October 2015. Deposition depths were measured multiple times throughout the year. Clay horizon markers were deployed again at 9 of the 2015 sites plus one additional site in October-November 2016 and, again, measured throughout the year. Sediment measurements are summarized in spreadsheet tables.

This dataset contains cross-section geometry and sediment-size data collected in the fall of 2019 from Muddy Creek and North Fork Gunnison River below Paonia Reservoir, western Colorado. Six cross sections were surveyed using Real-Time Kinematic Global Navigation Satellite System (RTK-GNSS) methods to document channel geometry below Paonia Reservoir. One cross section was surveyed on Muddy Creek below Paonia Reservoir, and five cross sections were surveyed from North Fork Gunnison River below Paonia Reservoir. All six cross sections are incorporated in this data release within one shapefile. Pebble counts were performed at each of the six cross sections to document sediment-size downstream from the reservoir. Four transects were completed at each cross section, where sediment size was measured and recorded. Sediment-size data are presented in .CSV files, with one file for each cross-section location, incorporating all of the data for each of the four transects at that location.

This data set contains cross-section geometry and sediment-size distribution data collected in the fall of 2017 from Muddy Creek and North Fork Gunnison River below Paonia Reservoir, western Colorado. Six cross-sections were surveyed using Real-Time Kinematic Global Navigation Satellite System (RTK-GNSS) methods to document channel geometry below the reservoir in 2015. Those same cross-sections were re-surveyed using the same methods in 2016 and 2017 to document any changes. One cross-section was surveyed on Muddy Creek below Paonia Reservoir, and five cross-sections were surveyed from North Fork Gunnison River below Paonia Reservoir. All six cross-sections are incorporated in this data release within one shapefile. Pebble counts were performed at each of the six cross-sections to document sediment-size distributions downstream from the reservoir. Four transects were located in the vicinity of each cross-section, where sediment size was measured and recorded. All of the sediment-size distribution data are presented in .CSV files, with one file for each cross-section location incorporating all of the data for each of the four transects at that location.

The USGS Wyoming-Montana Water Science Center (WY–MT WSC) completed a report (Sando and McCarthy, 2018) documenting methods for peak-flow frequency analysis following implementation of the Bulletin 17C guidelines. The methods are used to provide estimates of peak-flow quantiles for 66.7-, 50-, 42.9-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (AEPs) for selected USGS streamgages. This data release presents peak-flow frequency analyses for selected streamgages in Carter, Custer, Fallon, Powder River, and Prairie Counties, Montana, based on data through water year 2022, using methods described by Sando and McCarthy (2018).

The USGS Wyoming-Montana Water Science Center (WY–MT WSC) completed a report (Sando and McCarthy, 2018) documenting methods for peak-flow frequency analysis following implementation of the Bulletin 17C guidelines. The methods are used to provide estimates of peak-flow quantiles for 66.7-, 50-, 42.9-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (AEPs) for selected USGS streamgages. This data release presents peak-flow frequency analyses for selected streamgages in Carter, Custer, Fallon, Powder River, and Prairie Counties, Montana, based on data through water year 2022, using methods described by Sando and McCarthy (2018).

This dataset contains cross-section geometry and sediment-size distribution data collected in the fall of 2018 from Muddy Creek and North Fork Gunnison River below Paonia Reservoir, western Colorado. Six cross-sections were surveyed using Real-Time Kinematic Global Navigation Satellite System (RTK-GNSS) methods to document channel geometry below the reservoir in 2015. Those same cross-sections were re-surveyed using the same methods in 2018 to document any changes. One cross-section was surveyed on Muddy Creek below Paonia Reservoir, and five cross-sections were surveyed from North Fork Gunnison River below Paonia Reservoir. All six cross-sections are incorporated in this data release within one shapefile. Pebble counts were performed at each of the six cross-sections to document sediment-size distributions downstream from the reservoir. Four transects were located in the vicinity of each cross-section, where sediment size was measured and recorded. All of the sediment-size distribution data are presented in .CSV files, with one file for each cross-section location incorporating all of the data for each of the four transects at that location.

This point dataset contains geologic information concerning regolith thickness and top-of-bedrock altitude at selected well and test-hole locations in the Lower Gunnison River Basin in Delta, Montrose, Ouray, and Gunnison Counties, Colorado. Regolith-thickness data were compiled from lithologic logs of wells and boreholes reported by the Colorado Division of Water Resources, U.S. Geological Survey, and Bureau of Reclamation. Bedrock-altitude values were computed from the bedrock altitude raster dataset (bralt). The U.S. Geological Survey prepared this dataset in cooperation with the Colorado Water Conservation Board.