PSMBP - Helena Valley Unit Water Data


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PSMBP - Helena Valley Unit
Water Data

PSMBP - Helena Valley Unit - Main Page

Project Water Supply

Current Conditions:

Reservoir Storage

Current Water Levels and Releases for Missouri River Basin Reservoirs above Canyon Ferry Reservoir
Canyon Ferry Reservoir Current Water Level and Releases
Helena Valley Reservoir

Weather Conditions (NOAA)

Precipitation

Streamflow

Missouri River at Toston, Montana (USGS)

Streamflow Forecast Map

Spring and Summer (NRCS)

Snowpack Information

Mountain Snowpack Maps for Missouri River Basin

Drought Index

Palmer Drought Index Map
Explanation of Palmer Drought Severity Index (Text)

Historic Conditions:

Annual Precipitation

Normal	12.04 in
Maximum - 1975	20.94 in
Minimum - 1973	6.26 in
Helena, Montana 1961-1990

Temperature

Mean Annual	45 °F
Daily Maximum - 08/24/1969	105 °F
Daily Minimum - 01/25/1984	-42 °F
Helena, Montana 1948-1996
Growing Season	146 days
Elevation of irrigable area	3,750 ft

Missouri River

Drainage area above Canyon Ferry Dam	15,860 mi²
Annual discharge near Toston, Montana:
Maximum - 1984	2,782,000 acre-ft
Minimum - 1992	1,132,000 acre-ft
Average - 1941-1996	1,911,754 acre-ft

ProjectWater Quality

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