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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 on tributaries of the Bighorn, Tongue, and Lower Yellowstone Rivers, based on data through water year 2021 that were based on methods described by Sando and McCarthy (2018).
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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 on tributaries of the Bighorn, Tongue, and Lower Yellowstone Rivers, based on data through water year 2021 that were based on methods described by Sando and McCarthy (2018).
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Layered geospatial PDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features. This map is derived from GIS (geospatial information system) data. It represents a repackaging of GIS data in traditional map form, not creation of new information. The geospatial data in this map are from selected National Map data holdings and other government sources.
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Layered geospatial PDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features. This map is derived from GIS (geospatial information system) data. It represents a repackaging of GIS data in traditional map form, not creation of new information. The geospatial data in this map are from selected National Map data holdings and other government sources.


map background search result map search result map USGS Topo Map Vector Data (Vector) 38982 Ruskosky Ridge, Montana 20200722 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 42143 South Bear Creek, Montana 20200722 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 18557 Griffin Coulee NW, Montana 20200721 for 7.5 x 7.5 minute FileGDB 10.1 USGS US Topo 7.5-minute map for Griffin Coulee SW, MT 2020 USGS US Topo 7.5-minute map for Marsh Coulee, MT 2020 Peak-flow frequency analyses for selected streamgages on tributaries of the Bighorn, Tongue, and Lower Yellowstone Rivers, based on data through water year 2021 Results of peak-flow frequency analyses for selected streamgages on tributaries of the Bighorn, Tongue, and Lower Yellowstone Rivers, based on data through water year 2021 USGS Topo Map Vector Data (Vector) 38982 Ruskosky Ridge, Montana 20200722 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 42143 South Bear Creek, Montana 20200722 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 18557 Griffin Coulee NW, Montana 20200721 for 7.5 x 7.5 minute FileGDB 10.1 USGS US Topo 7.5-minute map for Griffin Coulee SW, MT 2020 USGS US Topo 7.5-minute map for Marsh Coulee, MT 2020 Peak-flow frequency analyses for selected streamgages on tributaries of the Bighorn, Tongue, and Lower Yellowstone Rivers, based on data through water year 2021 Results of peak-flow frequency analyses for selected streamgages on tributaries of the Bighorn, Tongue, and Lower Yellowstone Rivers, based on data through water year 2021