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Levels Home Current Events Drought Management Plan History Minimum Flows 60-Year Low Lakers Lake Levels Position Statement

Updated 23 March 2002

Flathead Lake Elevations Pre & Post Kerr Dam Monthly & Annual Norms and Ranges

Summary Operations Constraints imposed by mitigation plan Hydrographs of recent years Notes on the data Links to Realtime Data for Lake Elevations & Streamflows

Notes on the Data The data displayed by the graphs are available from web site of the United States Geological Survey, which maintains a vast network of river gauging stations. The record is continuous from approximately mid-1928 to the present, with limited data available prior to that. Locally, the record for the Flathead River below Polson is the longest, beginning on 1 August 1907. Only the period 1 November 1927 through 31 March 1928 is missing. Records for the river at Columbia Falls begin in 1922, but are incomplete and spotty until mid-1928 (there are some older records for the north, middle, and south forks). In some cases, it is possible to approximate the flow at Columbia Falls by summing the flows of the three forks. The published record for Flathead Lake runs from May, 1928, to the present, except for December of 1928 and January of 1929. Unpublished data evidently exist in the USGS's office in Helena. I generated the graphs using KaleidaGraph 3.51 for the Macintosh. -- James Conner

Realtime Lake Elevations & Streamflow Data U.S. Geological Survey National Home Page Montana Home Page Surface Water Data for Montana Realtime Water Data Home Page Flathead Lake Flathead Lake Level at Polson. USGS. U.S. Army Corps of Engineers, Seattle District Home Page. River Basins. All basins in the Seattle district. A subset is below. Flathead/Clark Fork river basins. Links to tabular and graphical data. Hungry Horse Dam Kerr Dam Flathead & Clark Fork River Basins Mainstem 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 near Polson. Mainstem at Perma. South Fork Jocko River near Arlee. Clark Fork River At Plains Stillwater River near Whitefish Swan River near Bigfork  Whitefish River near Kalispell Kootenai River Basin Fisher River near Libby. Kootenai River near Libby Dam. Thompson River near Thompson Falls. Yaak River near Troy. Northwest River Forecast Top of page.

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