Rock River at Afton, WI
River level and flood forecast · Rock County
Normal5.8 ftas of Mon 11 PM
The river is 3.2 ft below flood stage (9 ft).
Flow: 3,030 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts Rock River at Afton to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 12.2 ft |
| Moderate flood stage | 11.1 ft |
| Flood stage | 9 ft |
| Action stage | 8 ft |
| Record crest (June 21, 2008) | 13.51 ft |
What floods at each level
From the National Weather Service, highest first.
- 13 ftThere is widespread flooding in the Afton and Janesville areas. Numerous roads and streets are impacted including South River Road near Janesville airport, several blocks of Joseph and Charles Streets, and the on ramp to Memorial Drive. The intersection of Wall Street and Main Street is closed. Traxler Park in Janesville is flooded and closed. Water may impact homes on N River Rd. Water touches bottom of Grand Ave bridge.
- 12.7 ftThere is widespread flooding in the Afton and Janesville areas. Numerous roads and streets are closed including South River Road on the south side of Janesville, several blocks of Joseph and Charles Streets, a portion of Main Street, and North Loop Road at Traxler Park. The on-ramp to Memorial Drive is closed. Traxler Park in Janesville is flooded and closed. The intersection of Wall Street and Main Street is flooded. Water backfills into Fisher Creek and hits RR tracks.
- 12.2 ftFlooded roads: South River Road near Janesville airport and near W Avalon Rd, several blocks of Joseph and Charles Streets, a portion of Main Street, and North Loop Road at Traxler Park, bleachers surrounded, the on-ramp to Memorial Drive, a portion of Riverside Drive. Peace Trail and Traxler Park off of Memorial Drive floods. Water approaches homes on N River Rd, water surrounds a home on S Christian Rd and another across the river and along W Bass Creek Rd. RR tracks near W Tripp Rd flood.
- 11.5 ftWater 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. Traxler Park off of Memorial Drive in Janesville is flooded, including boat ramp.
- 11.1 ftFloodwaters affect Riverside Park and a road in Riverside park on the north side of Janesville and South River Road on the south side of Janesville. Floodwaters affect low spots on South River Rd on the south side of Janesville. Floodwaters affect a home on South Christian Rd on the east side of the river in the Afton area. There is extensive lowland and agricultural land flooding in the Afton and Janesville areas.
- 10.5 ftFloodwaters affect Riverside Park on the north side of Janesville and South River Road on the south side of Janesville. Floodwaters affect low spots on South River Rd on the south side of Janesville. Floodwaters affect a home on South Christian Rd on the east side of the river in the Afton area. There is extensive lowland and agricultural land flooding in the Afton and Janesville areas.
- 10 ftFloodwaters affect the property of a home on South Christian Road and S Christian Rd floods. Minor erosional flood damage occurs to lowland and agricultural land adjacent to the river the Afton and Janesville areas.
- 9 ftFloodwaters affect property of a home on South Christian Road on the east side of the river in the Afton area. There is minor erosional flood damage to lowland and agricultural land in the Afton and Janesville areas.
- 8.5 ftFloodwaters spread into lowland and agricultural land adjacent to the river in the Afton and Janesville areas.
- 8 ftWater overflows the lower river banks in the Afton and Janesville areas. The river width is about 240 feet in the area of the gauge.
Highest crests on record
- 13.51 ft — June 21, 2008
- 13.05 ft — February 5, 1916
- 12.21 ft — January 23, 2008
- 12.11 ft — April 18, 2026
- 11.86 ft — April 5, 1979
Recent crests: 12.11 ft (April 18, 2026) · 10.79 ft (July 16, 2024) · 9.5 ft (June 13, 2024) · 9.12 ft (April 10, 2024) · 7.27 ft (April 13, 2022)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (AFTW3); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.