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This probabilistic forecast is issued by the North Central River Forecast Center.
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About this graph
Forecasts for the Rock River at Lake Koshkonong are issued as needed during times of high water, but are not routinely available.
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Upstream Gauge - at Fort Atkinson Upstream Gauge
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 11.5
Moderate Flood Stage: 11
Flood Stage: 10
Action Stage: 9
Low Stage (in feet): -9999

Historic Crests
(1) 15.13 ft on 06/21/2008
(2) 12.35 ft on 04/22/2013
(3) 12.23 ft on 04/25/1993
(4) 11.65 ft on 04/18/2008
(5) 11.62 ft on 09/12/2018
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 11.02 ft on 10/15/2019
(2) 10.95 ft on 10/15/2019
(3) 11.50 ft on 03/25/2019
(4) 11.07 ft on 10/15/2018 (P)
(5) 11.62 ft on 09/12/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 4.98 ft on 12/06/2012
(2) 5.10 ft on 12/28/1999
(3) 5.49 ft on 02/26/2021
(4) 5.52 ft on 11/05/2015
(5) 5.74 ft on 09/12/2003
Show More Low Water Records
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Gauge LocationGauge Map Marker
 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 Collapse
If you notice any errors in the below information, please contact our Webmaster
14 There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
13 There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
12 There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
11.26 There is knee-deep water over Blackhawk Island Road. Lamp Road on west side of river also becomes flooded. Lake Koshkonong merges with Mud Lake to the east of Lake Koshkonong.
11.1 There is widespread flooding of roads and docks in the Town of Koshkonong and Town of Sumner including Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
11 In the Town of Lake Koshkonong, floodwaters affect Vets Lane, Blackhawk Island Road, and Oxbow Bend Road.
10.5 Floodwaters reach Oxbow Bend Road in the area of the gage on the east side of the lake.
10 Floodwaters affect homes and boat docks in the Blackhawk Island area of Lake Koshkonong on the north side of the lake. Floodwaters spread over low spots on Blackhawk Island Road in the area where the Rock River enters the lake.
9.5 Water is into low lying areas along Lake Koshkonong.
9 Water spreads into low lying areas along Lake Koshkonong.
Photos
(1) April_2013_flooding_1_Lk_Koshkonong
(2) Indianford dam covered with floodwaters-April 2013

Other Real-time and/or Archive Data Sources:
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How low could the river get?
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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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