Boise Project  -  Main Page

Project Water Supply

Current Conditions:

Reservoir Storage

Major Storage Reservoirs in the Boise & Payette River Basins

Weather Conditions (NOAA)

Precipitation

Streamflow

Boise River at Glenwood Bridge near Boise, Idaho (USGS)
Payette River near Horseshoe Bend, Idaho (USGS)

Streamflow Forecast Map

Spring and Summer (NRCS)

Snowpack Information

Columbia River Snowpack Summary (NRCS)
Mountain Snowpack Maps for Columbia River Basin (NRCS)

Drought Index

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

Historic Conditions:

Annual Precipitation

Normal 12.11 in   Maximum  -  1983 18.77 in   Minimum   -  1966 6.64 in   Boise, Idaho  -  1961-1990


          Temperature

Mean Annual 50.9 °F   Daily Maximum  -  07/19/1960 111 °F   Daily Minimum   -  12/22/1990 -25 °F   Boise, Idaho  -  1940-1996   Growing Season 177 days   Elevation of irrigable area 2,500 ft


          Boise River

Drainage area above Boise River Diversion Dam 2,680 mi2   Annual discharge:       Maximum  -  1965 3,462,036 acre-ft       Minimum   -  1992 836,499 acre-ft       Average    -  1895-1996 2,054,783 acre-ft


Payette River

Drainage area above Horseshoe Bend, Idaho 2,230 mi2   Annual discharge:       Maximum  -  1996 3,824,885 acre-ft       Minimum   -  1931 1,016,255 acre-ft       Average    -  1906-1996 2,311,949 acre-ft


 

Boise River:

Boise-Mores
Lower Boise
North and Middle Forks Boise
South Fork Boise

Payette River:

Middle Fork Payette
North Fork Payette
Payette
South Fork Payette

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