| 20.0 | There will be severe flooding of farmland roads, bridges and homes from Prosser downstream to the Columbia River, especially in Benton City. | | 17.4 | There will be widespread flooding of farmlands, roads and residential areas from Prosser to the Columbia River. | | 15.0 | At this level, there will be moderate flooding of farmland, roads and some residental areas. | | 13.0 | There will be minor flooding of pastures and roads adjacent to the river...especially in low lying areas of West Richland. |
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1) 21.57 ft on 12/23/1933
2) 20.98 ft on 02/11/1996
3) 20.12 ft on 11/17/1906
4) 18.65 ft on 01/18/1974
5) 17.20 ft on 05/31/1948
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Low water records are unavailable.
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