GEOGRAPHIC INFORMATION

Yellowstone River Corridor Hydraulic Analysis Models and Maps

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Data Provider US Army Corps of Engineers Omaha District
Date 2016
Content Type Downloadable Data
Abstract Hydraulic modeling was performed in support of the Yellowstone River Corridor Cumulative Effects Assessment (CEA). The CEA is a joint effort of the Yellowstone River Conservation Districts Council and the U.S. Army Corps of Engineers, Omaha District (Omaha District). For complete information on the processes and data used for the models, please see the Final Hydraulics Report included with each downloadable file.The hydraulic analysis characterizes the impacts of human development, including man-made structures, encroachments, storage, diversions, and depletions on the Yellowstone River hydraulic profiles and flood boundaries by comparing current and "prehistoric" conditions. Human impacts have been evaluated by modeling two geometry files and two flow files. The geometry files include "Developed" conditions (i.e., the file represents current conditions with existing bridges, embankments, diversion dams, etc.) and "Undeveloped" conditions (i.e., human made structures will be manually removed from the geometry file.) The flow files include "Regulated" conditions (i.e., hydrologic discharges representing current conditions resulting from human-controlled reservoirs, irrigation canals, etc.) and "Unregulated" conditions (i.e., hydrologic discharges representing natural conditions). Four scenarios have been evaluated for a range of flood events using the hydraulic model by modeling combinations of the "Developed" and "Undeveloped" geometry and "Regulated" and "Unregulated" flow files.The hydraulic analysis utilized the US Army Corps of Engineers river modeling software HEC-RAS and geospatial software ArcGIS and the Geo-RAS extension for model geometry development and floodplain mapping. Flow information was obtained from an intensive hydrology study of the basin performed jointly by Montana U.S. Geological Survey (USGS) and Omaha District. Hydraulic models and inundations were developed for the Yellowstone River reaches for Sweet Grass, Stillwater, Yellowstone, Treasure, Rosebud, Custer, Prairie, Dawson, Richland and McKenzie Counties in Montana and North Dakota.For each combination of scenarios and events evaluated in each county, the data available for download include a inundation depth grid with 2.5-meter cells, a inundated area shapefile developed from the outline of the inundation depth grid, and HEC-RAS model result spreadsheets showing modeled stream flow, velocity, depth, and other information for stations at approximately every 1000 feet along the river.Data sources used in the models include aerial photography and LiDAR-derived digital elevation models and partial bathymetry collected in 2004 and 2007 by Aerial Surveys International, LLC, Eisenbraun and Associates, Merrick and Company, and Chris Ransome and Associates, available through the Yellowstone corridor clearinghouse at the Montana State Library. Hydrology was obtained for the Regulated and Unregulated flows for the lower reach from the USGS (Streamflow Statistics for Unregulated and Regulated Conditions for Selected Locations on the Yellowstone, Tongue, and Powder Rivers, Montana, 1928-2002 (2013). http://pubs.usgs.gov/sir/2013/5173/) and for the upper reach from US Army Corps of Engineers, Omaha District (Yellowstone River Corridor Study, Upper Yellowstone River Hydrology, 2011). USGS Montana, Yellowstone River Corridor Bridge Survey (2005-2009), unpublished.
Purpose The purpose of the hydraulic analysis is to develop the water surface profiles and flood boundary delineations for selected annual exceedance floods under open water conditions in the reach of the Yellowstone River from the Park-Sweet Grass County line to the confluence with the Missouri River. This study is part of the Yellowstone River Corridor Study, from which resulting hydraulic information is utilized in defining the current and historic extent of the Yellowstone River floodplain to support the Cumulative Effects Assessment and the development of a comprehensive plan that provides for sustainable use of the river and its floodplain for both economic and environmental needs for the Yellowstone River Corridor Study.
Supplemental Information
The HEC-RAS models and mapping products were generated specifically to support the Yellowstone River Cumulative Effects Assessment. Use of these products for any other intent is not endorsed, as the input data, methodology, assumptions, accuracies, etc. may not support extraneous efforts. Responsibility for the misuse and misinterpretation of the data and project intent is not assumed. No warranty is expressed or implied for any uses other than the purpose stated above. Provided HECRAS models and mapping products may be updated as additional input data and funding becomes available. The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.
Data Access https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Yellowstone_River_Clearinghouse/HydraulicModels
Distributor Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY: Montana Relay 711
Fax: 406-444-0266
Email: geoinfo@mt.gov
Distribution liability The HEC-RAS models and mapping products were generated specifically to support the Yellowstone River Cumulative Effects Assessment. Use of these products for any other intent is not endorsed, as the input data, methodology, assumptions, accuracies, etc. may not support extraneous efforts. Responsibility for the misuse and misinterpretation of the data and project intent is not assumed. No warranty is expressed or implied for any uses other than the purpose stated above. Provided HECRAS models and mapping products may be updated as additional input data and funding becomes available. The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.
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Metadata date 11/29/2016