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USGS Activities in Montana: Biology Geology Mapping Water

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       for the Upper Yellowstone River Red dot highlighting Realtime Link
Red dot highlighting Realtime Link Statistical Summaries of Streamflow
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  Red dot highlighting Realtime LinkMontana Water Data ReportsRed dot highlighting Realtime Link
  Estimating Flood Frequency in Montana

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AUGUST STREAMFLOWS AND
RESERVOIR STORAGE MOSTLY NORMAL

At eight long-term U.S. Geological Survey gaging stations, the monthly mean streamflows for the month of August were normal at five and below normal at three. The monthly mean streamflows at the following stations were normal:

  • Blackfoot River near Bonner
  • Clark Fork at St. Regis
  • Middle Fork Flathead River near West Glacier
  • Yellowstone River at Corwin Springs
  • Yellowstone River at Billings
The Yaak River near Troy, Marias River near Shelby, and Rock Creek below Horse Creek, near the international boundary had below-normal flow.

Water storage at five out of six major hydroelectric reservoirs in Montana remained in the normal range: Canyon Ferry Lake, Bighorn Lake, Lake Koocanusa, Hungry Horse Reservoir, and Flathead Lake. Storage remained below normal in Fort Peck Lake.

For the month of August, water storage at four major irrigation reservoirs was normal at two and below normal at two. Storage at Gibson and Fresno Reservoirs was normal. Storage at Lima Reservoir dropped to below normal and Clark Canyon Reservoir remained below normal.

The following summary lists preliminary streamflow and reservoir data and long-term-average values for purposes of comparison.

Supporting data are available online

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