Station Name: LAKE MONONA AT MADISON, WI
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 840 feet

Nearest Address:
795 W Washington Ave
Madison, WI 53715
Dane County

GPS Coordinates: 43.0633297, -89.3970636

Nearby Water Temperatures

Flood Warning issued May 4 at 9:18PM CDT until May 7 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon May 4, 2026, 9:18 PM
Expires: Tue May 5, 2026, 9:30 AM

...The Flood Warning is extended for the following rivers in Wisconsin... Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. ...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until early Thursday afternoon. * IMPACTS...At 9.0 feet, 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. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 9.4 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 PM CDT Monday was 9.5 feet. - Forecast...The river is expected to rise to a crest of 9.4 feet just after midnight tonight. It will then fall below flood stage Thursday morning. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 9.4 feet on 03/29/2011. - http://www.weather.gov/safety/flood

Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov. The next statement will be issued Tuesday morning at 930 AM CDT.

Flood Warning issued May 4 at 9:18PM CDT until May 6 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon May 4, 2026, 9:18 PM
Expires: Tue May 5, 2026, 9:30 AM

...The Flood Warning is extended for the following rivers in Wisconsin... Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. ...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until early Wednesday afternoon. * IMPACTS...At 10.0 feet, 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. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 10.2 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 PM CDT Monday was 10.3 feet. - Forecast...The river is expected to fall below flood stage Wednesday morning and continue falling to 9.0 feet Monday, May 11. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.1 feet on 03/30/2011. - http://www.weather.gov/safety/flood

Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov. The next statement will be issued Tuesday morning at 930 AM CDT.

Flood Warning issued May 5 at 2:32AM CDT until May 7 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Tue May 5, 2026, 2:32 AM
Expires: Tue May 5, 2026, 2:45 PM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until early Thursday afternoon. * IMPACTS...At 9.0 feet, 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. * ADDITIONAL DETAILS... - At 2:00 AM CDT Tuesday the stage was 9.3 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 2:00 AM CDT Tuesday was 9.5 feet. - Forecast...The river is expected to fall below flood stage Thursday morning and continue falling to 8.1 feet Monday evening. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 9.4 feet on 03/29/2020. - http://www.weather.gov/safety/flood

Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov. The next statement will be issued this afternoon at 245 PM CDT.

Flood Warning issued May 5 at 2:32AM CDT until May 6 at 1:00PM CDT by NWS Milwaukee/Sullivan WI

Effective: Tue May 5, 2026, 2:32 AM
Expires: Tue May 5, 2026, 2:45 PM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until early tomorrow afternoon. * IMPACTS...At 10.0 feet, 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. * ADDITIONAL DETAILS... - At 2:00 AM CDT Tuesday the stage was 10.1 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 2:00 AM CDT Tuesday was 10.3 feet. - Forecast...The river is expected to fall below flood stage tomorrow morning and continue falling to 9.0 feet Monday evening. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.1 feet on 03/30/2011. - http://www.weather.gov/safety/flood

Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov. The next statement will be issued this afternoon at 245 PM CDT.

Flood Warning issued May 4 at 9:18PM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon May 4, 2026, 9:18 PM
Expires: Tue May 5, 2026, 9:30 AM

...The Flood Warning is extended for the following rivers in Wisconsin... Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. ...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Afton affecting Winnebago and Rock Counties. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring. * WHERE...ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE. * WHEN...Until further notice. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 10.2 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 PM CDT Monday was 10.3 feet. - Forecast...No forecast is available for this location. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.2 feet on 03/06/2017. - http://www.weather.gov/safety/flood

Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov. The next statement will be issued Tuesday morning at 930 AM CDT.