PSMBP - Yellowtail Unit Water Data


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PSMBP - Yellowtail Unit
Water Data

PSMBP - Yellowtail Unit - Main Page

Project Water Supply

Current Conditions

Reservoir Storage (Teacup Diagram)

Current Reservoir Levels - Bighorn Lake

Weather Condition (NOAA)

Big Horn, Montana

Northern Big Horn, Montana

Yellowstone, Montana

Precipitation

Streamflow

Bighorn River near St. Xavier, Montana (USGS)

Drought Index

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

Historic Conditions

Annual Precipitation

Normal	15.08 in
Maximum - 1978	26.81 in
Minimum - 1979	8.41 in
Billings, Montana 1961-1990

Temperature

Mean Annual	47 °F
Daily Maximum - 07/19/1960	105 °F
Daily Minimum - 12/24/1983	-32 °F
Billings, Montana 1948-1996
Growing Season	148 days

Bighorn River

Drainage area above Yellowtail Dam	19,667 mi²
Annual discharge
Maximum - 1947	3,703,138 acre-ft
Minimum - 1934	244,802 acre-ft
Average - 1934-1996	2,528,052 acre-ft

Project Water Quality

Big Horn Lake
Upper Bighorn

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