Rock River at Lake Koshkonong
Wisconsin — Water Level & Flood Stage
Located in Rock County, Wisconsin on the Rock River. Live water level data from USGS gauge 05427235, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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Flood Stages
Major Flood
11.5 ft
Moderate Flood
11 ft
Minor Flood
10 ft
Action Stage
9 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
14 ft
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 ft
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 ft
There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
11.3 ft
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 ft
In the Town of Lake Koshkonong, floodwaters affect Vets Lane, Blackhawk Island Road, and Oxbow Bend Road. 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.
10.5 ft
Floodwaters reach Oxbow Bend Road in the area of the gage on the east side of the lake. Flooded roads: The end of Road 9, end of E Road 8 St, end of E Road 7, Lakeview Dr, Charley Bluff Rd north of Royce Dallman Park, parts of Lamp Rd, Willow Rd, parts of Blackhawk Island Rd. Water surrounds some structures on Lamp Rd and towards end of Blackhawk Island Rd. Low lying areas of Lakeland Campground flood. Altpeter County Park floods. Water into yards along High Ridge Rd.
10 ft
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 ft
Water is into low lying areas along Lake Koshkonong. Water approaches homes along Blackhawk Island.
9 ft
Water spreads into low lying areas along Lake Koshkonong. Water into yards along Blackhawk Island.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jun 21, 2008 | 15.13 ft | — |
| Jun 21, 2008 | 15.13 ft | — |
| Apr 21, 2013 | 12.35 ft | — |
| Apr 21, 2013 | 12.35 ft | — |
| Apr 24, 1993 | 12.23 ft | — |
Flood Inundation Map
NOAA has mapped what areas flood at different water levels for this gauge. View the interactive flood inundation map →
About This Gauge
Get Flood Alerts for Rock River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Rock River at Lake Koshkonong?
The Rock River at Lake Koshkonong gauge is maintained by USGS (site 05427235) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Rock River at Lake Koshkonong?
The NWS-defined flood stage for Rock River at Lake Koshkonong is 10 feet. Action stage begins at 9 feet. Moderate flooding starts at 11 feet, and major flooding at 11.5 feet.
How do I get alerts when Rock River rises?
Download StormCast free on Google Play, go to River Gauges, and add Rock River at Lake Koshkonong to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Rock River at Lake Koshkonong gauge located?
The gauge is located in Rock County, Wisconsin at coordinates 42.8575°N, 88.9408°W. USGS site number: 05427235. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: Observations courtesy of U.S. Geological Survey
- River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.
- 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.