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Rathdrum Prairie Project
Rathdrum Prarie Project | Project History | Project Data | Contact Information

Project Data
Land Areas (1992)
Area Irrigated and Crop Value



Project # 227

Land Areas (1992)
Irrigable area:
Full Irrigation Service7,492 acres
Supplemental Service0 acres
Temporary Irrigation Service0 acres
Number of Irrigated Farms821
Residential, Commercial, Industrial Lands613 acres
Total Irrigable Lands8,105 acres

Population Served:

Farm Population Served2,934
Non-Farm Population Served2,997
Total Population Served5,931

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Area Irrigated and Crop Value
YearActual Area Irrigated (Acres)Crop Value (Dollars)

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Project Water Supply
Project Water Quality



Project Water Supply

Current Conditions


Coeur D`Alene River near Harrison, Idaho (USGS)

Streamflow Forecast Map

Spring and Summer (NRCS)
Snowpack Information

Mountain Snowpack Maps for Columbia River Basin
Columbia River Snowpack Summary
Drought Index

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


Historic Conditions

Annual Precipitation
Normal16.49 in
Maximum - 198322.64 in
Minimum - 198511.21 in
Spokane, Washington 1961-1990 


Mean Annual48 ?F
Daily Maximum - 07/26/1928108 ?F
Daily Minimum - 12/30/1968-25 ?F
Spokane, Washington 1889-1996 
Growing Season179 days
Elevation of irrigable area2,200 - 2,300 ft


Post Falls, Spokane River
Drainage area near Post Falls, Idaho3,840 mi2
Annual discharge: 
Maximum - 19747,793,615 acre-ft
Minimum - 19441,692,407 acre-ft
Average - 1913-19964,484,282 acre-ft


Spokane River near Post Falls, Idaho (USGS)

Hayden Lake Unit, Hayden Lake
Drainage area above Hayden Lake22.0 mi2
Annual inflow to Hayden Lake 
Maximum - 195041,132 acre-ft
Minimum - 19775,765 acre-ft
Average - 1948-199720,318 acre-ft


Hayden Creek below North Fork, near Hayden Lake, Idaho (USGS)
East Greenacres Unit, Wells
Average annual diversionacre-ft

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Project Water Quality

Upper Spokane

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Facilities in Operation
Carriage Facilities
Pumping Plants



Facilities in Operation
Canals9 mi
Laterals100 mi
Pumping Plants5
Irrigation, domestic, miunicipal, industrial wells14

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Carriage Facilities
LocationFrom Post Falls Unit Pumping Plant on the Spokane River about 3 miles east of Post Falls, Idaho.
Construstion period1945-1946
Length9 mi
Diversion Capacity60 cfs
Typical section, clay lining: 
Bottom width7 ft
Side slopes2:1
Water depth3.2 ft
Lining thickness: 
Compacted cla6 in
Gravel blanket6 in
Length2 mi


Pumping Plant Discharge Line
LocationFrom Post Falls Unit Pumping Plant north
Construstion period1974
Description:Steel pipe
Length3,000 ft
Diameter3.5 ft
Capacity60 cfs

Note: Hayden Lake Unit 2-mile discharge line in included in the project lateral system.

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Pumping Plants
DesignationNumber of unitsTotal capacity, cfsTotal dynamic head, ftTotal horsepower
Post Falls Unit2601501,350
Hayden Lake Unit220225700
East Greenacres Unit14874305,430

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Last updated: May 16, 2011