National Weather Service Advanced Hydrologic Prediction Service

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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via https://www.weather.gov/owp/operations, as described in the StoryMap here.

Weather Forecast Office Milwaukee/Sullivan, WI

North Central River Forecast Center

Hydrograph

River at a Glance

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Inundation
Mapping

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About this graph

Tabular Data (UTC)

Tabular Data (CDT)

Datum: NAVD88

Metadata

NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.

NOTE: Gauge reading affected by power generation.

Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Rock River at Afton are issued as needed during times of high water, but are not routinely available.

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Upstream Gauge

Downstream Gauge

Flood Categories (in feet)

Major Flood Stage:	12.2
Moderate Flood Stage:	11.1
Flood Stage:	9
Action Stage:	8
Low Stage (in feet):	-9999

Historic Crests
(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) 11.84 ft on 10/18/2015
(6) 11.84 ft on 04/18/2013
(7) 11.80 ft on 03/23/1929
(8) 11.77 ft on 04/10/1959
(9) 11.50 ft on 03/25/1918
(10) 11.41 ft on 04/23/1993
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.36 ft on 03/29/2020
(2) 10.48 ft on 10/15/2019
(3) 11.07 ft on 03/25/2019
(4) 9.86 ft on 01/26/2019
(5) 11.20 ft on 09/12/2018
(6) 9.79 ft on 05/21/2018
(7) 9.29 ft on 03/01/2018
(8) 11.12 ft on 02/21/2018
(9) 9.36 ft on 07/21/2017
(10) 8.94 ft on 04/07/2017
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.09 ft on 08/26/1934
(2) 1.89 ft on 09/20/2012
(3) 2.02 ft on 07/15/2012
(4) 2.28 ft on 09/07/2003
(5) 2.44 ft on 09/20/2005
Show More Low Water Records

For more information on your flood risk go to www.floodsmart.gov.

Show FEMA's National Flood Hazard Layers

Zoom Level:16

	Gauge Location	Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

If you notice any errors in the below information, please contact our Webmaster
13.3	There is widespread flooding in the Afton and Janesville areas. Numerous roads are closed including South River Road on the south side of Janesville, 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. This level is the 1 percent chance flood meaning there is a 1 percent chance of the river reaching this level in any given year.
13	This level is the 2 percent chance 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 and streets are closed including South River Road on the south side of Janesville and several blocks of Joseph and Charles Streets. The intersection of Wall Street and Main Street is closed. Traxler Park in Janesville is flooded and closed.
12.9	There is widespread flooding in the Afton and Janesville areas. Numerous roads are closed including South River Road on the south side of Janesville, several blocks of Joseph and Charles Streets, and North Loop Road at Traxler Park. The on-ramp to Memorial Drive is closed. The intersection of Wall Street and Main Street is closed. Traxler Park in Janesville is flooded and closed.
12.4	This level is about a 4 percent chance 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 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.
12.2	There is widespread flooding in the Afton and Janesville areas. Numerous roads and streets adjacent to the river 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 as is a portion of Riverside Drive. Traxler Park off of Memorial Drive in Janesville is flooded and 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. Traxler Park off of Memorial Drive in Janesville is flooded.
11.1	Floodwaters affect Riverside Park and South River Road in Janesville and there is widespread lowland and agricultural land flooding in the Afton and Janesville areas. This level is the 10 percent flood meaning that there is a 10 percent chance of the river reaching this level in any given year.
10.7	Floodwaters affect a road in Riverside Park on the north side of Janesville and South River Road on the south side of Janesville. There is extensive lowland and agricultural land flooding in the Afton and Janesville areas.
10.5	Floodwaters affect Riverside Park on the north side of Janesville and South River Road on the south side of Janesville. There is extensive lowland and agricultural land flooding in the Afton and Janesville areas.
10.4	Floodwaters affect low spots on South River Road on the south side of Janesville. Floodwaters affect a home on South Christian Road 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.
10.1	Floodwaters affect the property of a home on South Christian Road on the east side of the river in the Afton area. Minor erosional flood damage occurs to lowland and agricultural land adjacent to the river the Afton and Janesville areas. This level is the 20 percent chance flood meaning that there is a 20 percent chance in any given year of the river reaching this level.
9.1	Floodwaters 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.
9	Minor erosional flood damge occurs to lowland and agricultural land adjacent to the river in the Afton and Janesville areas.
8.8	Floodwaters affect lowland and agricultural land adjacent to the river in the Afton and Janesville areas. 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.
8.5	Floodwaters spread into lowland and agricultural land adjacent to the river in the Afton and Janesville areas.
8	Water overflows the lower river banks in the Afton and Janesville areas. The river width is about 240 feet in the area of the gauge.
Photos (1) Aerial photo looking north-Rock River at Afton, WI (2) Aerial photo looking west-Rock River at Afton, WI

About This Location

Latitude: 42.613611° N, Longitude: 89.071667° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	9 ft	Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum	Elevation (gauge height = 0)	Elevation (gauge height = flood stage)	Elevation information source
NAVD88	742.14 ft	751.14 ft	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	742.36 ft	751.36 ft	Older USGS topographic maps, NGVD29 benchmarks
MSL	Not Available	Not Available	Older USGS topographic maps, MSL benchmarks
Other	Not Available	Not Available

Current/Historical Observations:

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Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

NWS Information

National Weather Service
Milwaukee/Sullivan Weather Forecast Office
N3533 Hardscrabble Road
Dousman, WI 53118
(262) 965-2074
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Page last modified: 2-Nov-2020 7:29 PM

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