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Yakima Project - Main Page
Project Water Supply
Historic Conditions:
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Normal |
7.97 in |
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Maximum - 1983 |
13.22 in |
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Minimum - 1976 |
4.18 in |
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Yakima, Washington 1961-1990 |
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Mean Annual |
49.7 °F |
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Daily Maximum - 08/10/1971 |
110 °F |
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Daily Minimum - 02/01/1950 |
-25 °F |
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Yakima, Washington 1946-1996 |
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Growing Season |
177 days |
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Elevation of irrigable area |
400 - 2,200 ft |
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Drainage area above Keechelus Dam |
54.7 mi2 |
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Annual discharge: |
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Maximum - 1972 |
414,179 acre-ft |
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Minimum - 1930 |
152,098 acre-ft |
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Average - 1904-1978 |
240,416 acre-ft |
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Streamflows: Yakima River near Martin, Washington (USGS)
Kachess River
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Drainage area at Kachess Dam |
63.6 mi2 |
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Annual discharge: |
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Maximum - 1933 |
337,240 acre-ft |
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Minimum - 1945 |
90,516 acre-ft |
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Average - 1904-1978 |
210,591 acre-ft |
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Streamflows: Kachess River near Easton, Washington (USGS)
Cle Elum River
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Drainage area at Cle Elim Dam |
203 mi2 |
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Annual discharge: |
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Maximum - 1972 |
1,018,001 acre-ft |
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Minimum - 1913 |
374,883 acre-ft |
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Average - 1903-1978 |
672,783 acre-ft |
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Streamflows: Cle Elum River near Roslyn, Washington (USGS)
Bumping River
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Drainage area at Bumping Lake Dam |
70.7 mi2 |
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Annual discharge: |
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Maximum - 1950 |
324,126 acre-ft |
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Minimum - 1941 |
112,834 acre-ft |
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Average - 1909-1978 |
212,456 acre-ft |
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Streamflows: Bumping River near Nile, Washington (USGS)
Tieton River
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Drainage area at Tieton Dam |
187 mi2 |
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Annual discharge: |
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Maximum - 1972 |
599,384 acre-ft |
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Minimum - 1945 |
214,711 acre-ft |
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Average - 1909-1978 |
364,356 acre-ft |
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Streamflows: Tieton River near Naches, Washington (USGS)
Yakima River
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Drainage area above Parker |
3,660 mi2 |
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Annual discharge: |
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Maximum - 1916 |
4,057,351 acre-ft |
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Minimum - 1944 |
422,417 acre-ft |
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Average - 1908-1978 |
1,825,149 acre-ft |
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Streamflows: Yakima River near Parker, Washington (USGS)
Project Water Quality
Lower Yakima River
Naches River
Upper Yakima River
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