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Weather Forecast Office Milwaukee/Sullivan, WI

North Central River Forecast Center

Hydrograph

River at a Glance

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Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental) Not Available

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Printable Image About this graph Tabular Data (UTC) Tabular Data (CDT) Datum: NAVD88 Metadata

Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions NOTE: Forecasts for the Wisconsin River at Portage 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: 19 Moderate Flood Stage: 18 Flood Stage: 17 Action Stage: 12.7 Low Stage (in feet): -9999 Historic Crests (1) 20.66 ft on 09/28/2010 (2) 20.50 ft on 09/14/1938 (3) 20.20 ft on 03/17/1973 (4) 20.08 ft on 04/22/2019 (5) 19.62 ft on 03/20/2016 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 18.91 ft on 04/18/2023 (2) 15.72 ft on 03/25/2022 (3) 18.18 ft on 04/01/2020 (4) 20.08 ft on 04/22/2019 (5) 17.73 ft on 03/28/2019 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) 6.50 ft on 08/14/1936 (2) 7.95 ft on 09/21/2012 (3) 8.69 ft on 09/09/2003 (4) 8.92 ft on 09/22/2005 (5) 9.09 ft on 08/22/2013 For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:16 Legend FEMA Layer 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

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21.5	Homes and roads are affected by floodwaters in the Blackhawk Park area as well as River Shores Road in the Town of Lewiston, River Oaks Road in the Town of Dekorra and Highway 51 in the Portage area. This level is about a 1 percent chance flood meaning that there is a 1 percent chance in any given year of the river reaching this level.
21	Local officials start sandbagging parts of Highway 51 south of Portage. Indian Trail in Lake Delton is flooded. Other roads that are flooded are River Oaks Road in the Town of Dekorra, River Shores Road in the Town of Lewiston, Levee Road, Summit St, Conant St, Wood Street and Thunderbird Road in the Portage area.
20.5	Indian trail in Lake Delton area is flooded. Other roads that are flooded are River Oaks Road in the Town of Dekorra, River Shores Road in the Town of Lewiston, Levee Road, Wood Street, Summit St, Conant St and parts of Thunderbird Road in the Portage area.
20	Sunset Point-Conant St underwater. Floodwaters affect homes in the Blackhawk Park area as well as River Oaks Road in the Town of Dekorra, River Shores Road in the Town of Lewiston, and Levee Road in the Portage area. Water is over Thunderbird Road.
19.5	Floodwaters are over Wood Street in Portage and a low spot on Thunderbird Road. Water comes up through ground at Sunset and Franklin. Floodwaters affect River Shores Road in the Town of Lewiston, River Oaks Road in the Town of Dekorra, and Levee Road in the Portage area, and numerous roads in the Blackhawk Park area about 3 miles south of Portage. Some water on Summit St near boat landing. Water over Conant St.
19	There is 1 foot of water over a low section of County Highway V in Dekorra. Floodwaters affect River Oaks Road and River Shores Road (Lewiston Township) as well as numerous roads in the Blackhawk Park area about 3 miles south of Portage.
18.5	Floodwaters affect River Shores Road about 3 miles upstream of Portage in the Town of Lewiston and River Oaks Road about 7 miles downstream of Portage in the Town of Dekorra in Columbia County. Water over Levee Rd and Tritz Rd. There is widespread flooding of roads in the Blackhawk Park Area including West Lake Road...Blackhawk Road and Wood Street. The Blackhawk Park area is on the south side of the river about 3 miles south of Portage.
18	Water surrounds seasonal homes along Old River Rd in the Blackhawk Park and 12 homes flooded on Hwy V. Old River Rd, W Lake Rd, Sec K Rd, Blackhawk R covered with water. West Lane Rd has 4 feet of water over it in places. Water over River Oaks Rd near Hwy V and Oak Knoll Rd in Town of Dekorra 7 miles downstream. Water at base of Caledonia/Lewiston Levee on Old River Rd. 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.
17.5	In the Blackhawk Park area in the Town of Caledonia, Old River Road is closed with water over it. West Lane Road in the Long Lake area is closed with about 4 feet of water over it in places. County Highway V and Oak Knoll Road in the Town of Dekorra have water up to the edge of the pavement. A few homes in the Town of Dekorra area near the river have water in the first floor and there is also flooding of outbuildings and yards.
17	There is general overflow of the river. Water is near homes in the Blackhawk Park area of Portage on the south side of the river along Old River Road. Floodwaters are over West Lake Road and Blackhawk Road in the Blackhawk Park area.
16	There is lowland flooding mainly in the Blackhawk Park area on the south side of the river. In the Blackhawk Park area...floodwaters about 40 inches deep flow over parts of West Lake Road and Blackhawk Road.
15	There is minor lowland flooding mainly in the Blackhawk Park area on the south side of the river. In the Blackhawk Park area...floodwaters are about 28 inches deep over parts of West Lake Road and Blackhawk Road. West Lane Road and Old River Road are underwater.
14	There are about 15 inches of water running over parts of West Lake Road and Blackhawk Road in the Blackhawk Park area. The boat landing on West Lake Road is flooded.
13.5	There about 11 inches of water over parts of West Lake Road and Blackhawk Road in the Blackhawk Park area on the south side of the river about 3 miles south of Portage. The boat landing on West Lake Raod is flooded.
12.7	There are about 3 inches of water running over 2 spots of West Lake Road and Blackhawk Road in the Blackhawk Park area on the south side of the river about 3 miles south of Portage. The boat landing on West Lake Road is starting to get some water on it.
Photos (1) Aerial photo showing Portage, WI levee. (2) Aerial photo looking downstream-Wis. River-Portage, WI June 2011 (3) Aerial photo of Wis. River-Portage, WI looking upstream-June 2011. (4) Street flooding from Wis. R. in Portage area 3/20/2016

About This Location

Latitude: 43.536350° N, Longitude: 89.473830° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 17 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 774.30 ft 791.30 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available

Additional Information

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Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Long Term Palmer Drought Severity Index Snow Information USGS WI Water Science High Water Mark Signs Levee Safety Information June 2008 National Flood Assessment How to Estimate River Ice Thickness Flood Resiliency at Wastewater Plants Manure Management Advisory System Historic Flooding Events For Southern Wisconsin Ice Jam Potential-4 sites in SE Wis.

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