| 12.9 | This level is about a 2 percent flood meaning there is a 2 percent chance in any given year of the river reaching this level. There is widespread flooding in the Afton and Janesville areas. Numerous roads adjacent to the river are closed. | | 12.2 | This level is about a 4 percent flood meaning there is a 4 percent chance in any given year of the river reaching this level. There is widespread flooding in the Afton and Janesville areas. Numerous roads adjacent to the river are closed. | | 11.5 | Water surrounds at least 2 homes near the river in the Afton area. Numerous secondary roads in the Afton area are closed to traffic. Floodwaters affect South River Road on the south side of Janesville. | | 11.1 | This level is about a 10 percent chance flood meaning there is a 10 percent chance in any given year of the river reaching this level. Floodwaters affect Riverside Park and South River Road in Janesville and there is widespread lowland flooding in the Afton area. | | 10.5 | Floodwaters affect Riverside Park and South River Road in Janesville. | | 10.4 | This level is about a 20 percent chance flood meaning that there is a 20 percent chance in any given year of the river reaching this level. Floodwaters start to affect low spots on South River Road on the south side of Janesville. | | 9.0 | Minor flood damage occurs in lowland and agricultural land adjacent to the river. | | 8.8 | This level is about a 50 percent chance flood meaning that there is a 50 percent chance in any given year of the river reaching this level. Floodwaters spread into lowland and agricultural land adjacent to the river. | | 8.5 | Floodwaters spread into lowland and agricultural land adjacent to the river. | | 8.0 | Water overflows the river banks. The river width is about 240 feet in the area of the gauging station. |
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1) 13.51 ft on 06/21/2008
2) 13.05 ft on 02/05/1916
3) 12.21 ft on 01/23/2008
4) 11.86 ft on 04/05/1979
5) 11.81 ft on 03/23/1929
6) 11.77 ft on 04/10/1959
7) 11.50 ft on 03/25/1918
8) 11.41 ft on 04/23/1993
9) 11.25 ft on 04/01/1975
10) 11.14 ft on 03/26/2009
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1) 0.09 ft on 08/26/1934
2) 2.28 ft on 09/07/2003
3) 2.44 ft on 09/20/2005
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