Wyoming-Montana Water Science Center
Wyoming and Montana FloodWatch
The USGS monitors flood and high-flow conditions at more than 300 streamgages across Montana and Wyoming. Water level and flow information are used by the National Weather Service to make accurate flood forecasts. The map to the right (from USGS's WaterWatch Web site) show the location of USGS streamgages in Montana and Wyoming currently at or above flood stage (depicted as a black triangle) or measuring high-flow conditions (depicted as blue circles). Hover over any symbol for a summary of currently flow conditions; select the symbol for more data and other information. High-flow conditions are expressed as percentiles comparing current (within the past few hours) instantaneous flow to historical daily mean flow for all days of the year. Flood stages are determined by the National Weather Service; not all USGS streamgages have flood stages. Current-conditions data are provisional and subject to change. A depiction of other streamgages at or above flood stage is available the NWS River Conditions Map.
Included on this page are maps, tables, and charts that summarize current flood conditions using data from USGS streamgages; photographs of current and historic flooding; information on mobile applications for current USGS streamflow data; and links to USGS flood publications and other resources for flood information.
Flood and High-Flow Photographs
2017 Water Year
Flood Apps and Pubs
Map of Flood and High-Flow Conditions in Montana and Wyoming.
Flood Tracking Charts
Selected streamgages 20170403
Other Current Flood and High-Flow Products
All the water in floods comes from the sky—but have you ever wondered just how many gallons of water falls on an area when it rains? You might be surprised at how much water comes down. Use our Water Science rainfall calculator to see how many gallons of water falls from the sky during a rainstorm.