| 30.0 | Major to disastrous flooding along the reach of the gage occurs. Major flooding occurs in the agricultural sections of Alexander Valley. | | 29.0 | Major flooding along the reach of the gage will occur. Homes...businesses and secondary roads in the lower sections of Healdsburg will begin to flood. The lower areas of Alexander Valley will begin to flood. | | 27.0 | Moderate flooding along the reach of the gage will occur. Some secondary roads south of US 101 will have minor to moderate flooding. | | 25.0 | Low lying areas south of US 101 begin to have minor flooding. | | 23.0 | Minor flooding of farm land and banks in rural areas along the reach of the gage will occur. |
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1) 30.80 ft on 12/01/1937
2) 30.00 ft on 02/28/1940
3) 27.00 ft on 12/23/1964
4) 26.23 ft on 01/09/1995
5) 26.16 ft on 12/22/1955
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Low water records are unavailable.
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