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Rathdrum Prairie Project - Main Page
Project Water Supply
Historic Conditions:
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Normal |
16.49 in |
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Maximum - 1983 |
22.64 in |
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Minimum - 1985 |
11.21 in |
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Spokane, Washington 1961-1990 |
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Mean Annual |
48 °F |
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Daily Maximum - 07/26/1928 |
108 °F |
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Daily Minimum - 12/30/1968 |
-25 °F |
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Spokane, Washington 1889-1996 |
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Growing Season |
179 days |
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Elevation of irrigable area |
2,200 - 2,300 ft |
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Drainage area near Post Falls, Idaho |
3,840 mi2 |
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Annual discharge: |
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Maximum - 1974 |
7,793,615 acre-ft |
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Minimum - 1944 |
1,692,407 acre-ft |
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Average - 1913-1996 |
4,484,282 acre-ft |
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Streamflows: Spokane River near Post Falls, Idaho (USGS)
Hayden Lake Unit, Hayden Lake
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Drainage area above Hayden Lake |
22.0 mi2 |
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Annual inflow to Hayden Lake |
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Maximum - 1950 |
41,132 acre-ft |
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Minimum - 1977 |
5,765 acre-ft |
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Average - 1948-1997 |
20,318 acre-ft |
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Streamflows: Hayden Creek below North Fork, near Hayden Lake, Idaho (USGS)
East Greenacres Unit, Wells
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Average annual diversion |
acre-ft |
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Project Water Quality
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