PSMBP - Lower Marias Unit Water Data


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PSMBP - Lower Marias Unit
Water Data

PSMBP - Lower Marias Unit - Main Page

Project Water Supply

Current Conditions:

Reservoir Storage

Major Storage Reservoirs in the Marias River Basin
Lake Elwell

Weather Conditions (NOAA)

Precipitation

Streamflow

Marias River near Chester, Montana (USGS)

Streamflow Forecast Map

Spring and Summer (NRCS)

Snowpack Information

Mountain Snowpack Maps for Missouri River

Drought Index

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

Historic Conditions:

Annual Precipitation

Normal	11.79 in
Maximum - 1975	23.34 in
Minimum - 1983	5.71 in
Cut Bank, Montana 1961-1990

Temperature

Mean Annual	40.9 °F
Daily Maximum - 08/05/1961	107 °F
Daily Minimum - 02/15/1936	-47 °F
Cut Bank, Montana 1903-1996

Marias River

Drainage area above Tiber Dam	4,927 mi²
Annual discharge:
Maximum - 1975	1,161,167 acre-ft
Minimum - 1955	22,385 acre-ft
Average - 1921-1996	308,602 acre-ft

Project Water Quality

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