U.S. Geological Survey

• National Home Page
  • Water Resources
  • Montana Home Page
    • Surface Water Data for Montana

Flathead Lake & Hungry Horse Reservoir

• Flathead Lake Level at Polson. USGS.
• Northwest River Forecast Center runoff (excellent graph)
• NWS Missoula Area Composite Hydrograph Page (crest projections) NEW
• U.S. Army Corps of Engineers, Seattle District Home Page.
  • Reservoir control home page.
    • All river basins in the Seattle district.
    • Flathead/Clark Fork river basins. Links to tabular and graphical data.
      • Hungry Horse Dam
      • Kerr Dam

Flathead River System

• Mainstem Flathead River at Columbia Falls.
• Middle Fork Flathead near West Glacier
• North Fork Flathead above Columbia Falls.
  • At British Columbia Border.
• South Fork Flathead below Hungry Horse Dam.
  • South Fork Flathead near Spotted Bear
• Mainstem Flathead River below Polson.
• Mainstem Flathead River at Perma.

Minor Rivers Above Flathead Lake

• Stillwater River near Whitefish (historical data only)
  • At Lawrence Park, Kalispell (current gauge site)
• Swan River near Bigfork 
• Whitefish River near mouth
• Ashley Creek south of Kalispell New

Lower Clark Fork River System

• Clark Fork River below Missoula
• Clark Fork River at St. Regis
• Clark Fork River at Plains
• Thompson River near Thompson Falls.

Kootenai River Basin

• Fisher River near Libby.
• Kootenai River near Libby Dam.
• Kootenai River near Leonia, ID (MT/ID border) New
• Yaak River near Troy.

Northwest River Forecast Center

• Water supply
  • Forecasts
  • Runoff

Worldwide Streamflow Data

• River Discharge Database. Streamflow data on more than 3,500 rivers around the world. Maintained by the Center for Sustainability and the Global Environment (SAGE) at the University of Wisconsin's Nelson Institute for Environmental Studies. The streamflow data are in cubic meters per second (one cubic meter per second equals 35.3 cubic feet per second).

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