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 April 27 at 3:51PM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon April 27, 2026, 3:51 PM
Expires: Tue April 28, 2026, 4:00 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. Rock River At Fort Atkinson affecting Jefferson County. Rock River At Afton affecting Winnebago and Rock Counties. Rock River At Jefferson affecting Jefferson County. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. Fox River Lower Near New Munster affecting Lake and Kenosha Counties. ...The Flood Warning is cancelled for the following rivers in Wisconsin... Fox River Near Berlin affecting Green Lake County. Crawfish River At Milford affecting Jefferson County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until further notice. * IMPACTS...At 10.5 feet, Floodwaters affect Riverside Park on the north side of Janesville and South River Road on the south side of Janesville. Floodwaters affect low spots on South River Rd on the south side of Janesville. Floodwaters affect a home on South Christian Rd 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. * ADDITIONAL DETAILS... - At 3:00 PM CDT Monday the stage was 10.6 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Monday was 10.7 feet. - Forecast...The river is expected to rise to a crest of 10.6 feet this evening. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 10.6 feet on 04/12/1923. - 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 500 PM CDT.

Flood Warning issued April 27 at 3:51PM CDT until May 4 at 1:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon April 27, 2026, 3:51 PM
Expires: Tue April 28, 2026, 4:00 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. Rock River At Fort Atkinson affecting Jefferson County. Rock River At Afton affecting Winnebago and Rock Counties. Rock River At Jefferson affecting Jefferson County. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. Fox River Lower Near New Munster affecting Lake and Kenosha Counties. ...The Flood Warning is cancelled for the following rivers in Wisconsin... Fox River Near Berlin affecting Green Lake County. Crawfish River At Milford affecting Jefferson County. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until Monday, May 04. * IMPACTS...At 11.3 feet, 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. * ADDITIONAL DETAILS... - At 3:00 PM CDT Monday the stage was 11.2 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Monday was 11.3 feet. - Forecast...The river is expected to rise to a crest of 11.2 feet this evening. It will then fall below flood stage Sunday evening. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 11.2 feet on 07/31/2010. - 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 500 PM CDT.

Flood Warning issued April 27 at 3:51PM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon April 27, 2026, 3:51 PM
Expires: Tue April 28, 2026, 4:00 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. Rock River At Fort Atkinson affecting Jefferson County. Rock River At Afton affecting Winnebago and Rock Counties. Rock River At Jefferson affecting Jefferson County. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. Fox River Lower Near New Munster affecting Lake and Kenosha Counties. ...The Flood Warning is cancelled for the following rivers in Wisconsin... Fox River Near Berlin affecting Green Lake County. Crawfish River At Milford affecting Jefferson County. * WHAT...Minor flooding is occurring. * WHERE...Rock River at Newville. * WHEN...Until further notice. * IMPACTS...At 7.5 feet, Floodwaters surround some homes near East Mallwood Drive and are into yards and roads across eastern Newville. Floodwaters affect a riverside restaurant and its parking lot on the south side of the river. * ADDITIONAL DETAILS... - At 3:00 PM CDT Monday the stage was 7.2 feet. - Bankfull stage is 5.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Monday was 7.6 feet. - Forecast...No forecast is available for this location. - Flood stage is 6.5 feet. - Flood History...This crest compares to a previous crest of 7.3 feet on 10/20/2018. - 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 500 PM CDT.

Flood Warning issued April 27 at 9:38PM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon April 27, 2026, 9:38 PM
Expires: Tue April 28, 2026, 9:45 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Fort Atkinson affecting Jefferson County. Fox River Lower Near New Munster affecting Lake and Kenosha Counties. Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. Rock River At Afton affecting Winnebago and Rock Counties. Rock River At Jefferson affecting Jefferson County. 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 further notice. * IMPACTS...At 10.5 feet, Floodwaters affect Riverside Park on the north side of Janesville and South River Road on the south side of Janesville. Floodwaters affect low spots on South River Rd on the south side of Janesville. Floodwaters affect a home on South Christian Rd 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. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 10.6 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Monday was 10.7 feet. - Forecast...The river is expected to rise to a crest of 10.6 feet just after midnight tonight. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 10.6 feet on 04/12/1923. - http://www.weather.gov/safety/flood

Caution is urged when walking near riverbanks. Motorists should not attempt to drive around barricades or drive cars through flooded areas. Additional information is available at www.weather.gov. The next statement will be issued Tuesday morning at 945 AM CDT.

Flood Warning issued April 27 at 9:38PM CDT until May 4 at 1:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Mon April 27, 2026, 9:38 PM
Expires: Tue April 28, 2026, 9:45 AM

...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Fort Atkinson affecting Jefferson County. Fox River Lower Near New Munster affecting Lake and Kenosha Counties. Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. Rock River At Afton affecting Winnebago and Rock Counties. Rock River At Jefferson affecting Jefferson County. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until Monday, May 04. * IMPACTS...At 11.3 feet, 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. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 11.2 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Monday was 11.3 feet. - Forecast...The river is expected to fall below flood stage Sunday evening and continue falling to 9.7 feet Monday, May 04. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 11.2 feet on 07/31/2010. - http://www.weather.gov/safety/flood

Caution is urged when walking near riverbanks. Motorists should not attempt to drive around barricades or drive cars through flooded areas. Additional information is available at www.weather.gov. The next statement will be issued Tuesday morning at 945 AM CDT.