Station Name: Seneca
Data Source: USGS

Elevation Above Sea Level: 499 feet

Nearest Address:
Harbor Lane
Seneca, IL 61360
La Salle County

GPS Coordinates: 41.2997, -88.6142

Nearby Water Temperatures

Flood Watch issued April 17 at 6:27PM CDT until April 18 at 5:00AM CDT by NWS Chicago IL

Effective: Fri April 17, 2026, 6:27 PM
Expires: Sat April 18, 2026, 4:00 AM

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Much of northern and central Illinois and extreme northwest Indiana. * WHEN...Until 5 AM CDT Saturday. * IMPACTS...Creeks and streams may rise out of their banks. Ongoing river flooding may worsen. Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded. Area creeks and streams are already elevated, increasing the risk of flooding due to additional rainfall. * ADDITIONAL DETAILS... - A line of thunderstorms, some capable of producing rainfall rates of up to 2 inches per hour, will move across the area this evening into the early overnight hours. Despite the expected relatively fast storm movement, anomalously high atmospheric moisture content will support high rainfall rates. In many areas, soil moisture remains very high, including near the Illinois-Wisconsin border where nearly saturated soils exist due to recent heavy rainfall. While many areas may see lighter accumulations less than 0.5 inches, soils will be very sensitive to rainfall. Areas near and downstream of heavy rainfall, particularly urban areas and locations in far northern Illinois, may see flash flooding and river flooding impacts, some locally significant. - http://www.weather.gov/safety/flood

A Flood Watch for flash flooding means rapid-onset flooding is possible, but not yet certain, based upon the latest forecasts. Flash flooding is a dangerous situation. Persons with interests along area rivers, creeks, and other waterways should monitor the latest forecasts and be prepared to take action should flooding develop.

Flood Warning issued April 17 at 1:46PM CDT by NWS Chicago IL

Effective: Fri April 17, 2026, 1:46 PM
Expires: Sat April 18, 2026, 8:00 AM

...The National Weather Service in Chicago IL has issued a Flood Warning for the following rivers in Illinois... Illinois River at La Salle affecting La Salle, Bureau and Putnam Counties. For the Illinois River (Upper)...including Ottawa, La Salle...Minor flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Illinois River from Starved Rock Lock and Dam downstream to confluence with Big Bureau Creek, including the La Salle gauge. * WHEN...From Saturday morning until further notice. * IMPACTS...At 22.0 feet, Lower parking lot at Starved Rock State Park is inundated east of La Salle. High water levels begin to impact shipping interests along the river. * ADDITIONAL DETAILS... - At 12:45 PM CDT Friday the stage was 19.5 feet. - Forecast...The river is expected to rise above flood stage late tomorrow morning and continue rising to a crest of 23.2 feet Monday morning. - Flood stage is 20.0 feet. - http://www.weather.gov/safety/flood

A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by Saturday morning.

Flood Watch issued April 17 at 1:46PM CDT until April 21 at 1:00PM CDT by NWS Chicago IL

Effective: Fri April 17, 2026, 1:46 PM
Expires: Sat April 18, 2026, 8:00 AM

...The National Weather Service in Chicago IL has issued a Flood Watch for the following rivers in Illinois... Illinois River at Ottawa affecting La Salle zone. ...The Flood Watch is replaced by a River Flood Warning for the following rivers in Illinois... Illinois River at La Salle affecting La Salle, Bureau and Putnam zones. For the Illinois River (Upper)...including Ottawa, La Salle... flooding is possible. * WHAT...Flooding is possible. * WHERE...Illinois River from Heritage Harbor east of Ottawa downstream to Starved Rock Lock and Dam, including the Ottawa gauge. * WHEN...From late Saturday night to early Tuesday afternoon. * IMPACTS...At 464.0 feet, Backwater causes the Fox River to reach bankfull near St. Elizabeth Medical Center in Ottawa. * ADDITIONAL DETAILS... - At 12:30 PM CDT Friday the stage was 461.6 feet. - Forecast...Flood stage may be reached early Sunday morning. - Flood stage is 463.0 feet. - http://www.weather.gov/safety/flood

A Flood Watch means water levels above flood stage are possible, but not yet certain, based upon the latest forecasts. Persons along rivers and streams in the watch area should monitor the latest forecasts and be prepared to take action should flooding develop. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by this afternoon.

Flood Warning issued April 17 at 11:17AM CDT by NWS Chicago IL

Effective: Fri April 17, 2026, 11:17 AM
Expires: Sat April 18, 2026, 5:30 AM

...The Flood Warning continues for the following rivers in Illinois... Fox River at Montgomery affecting Kendall and Kane Counties. Fox River at Algonquin Lock & Dam tailwater affecting Lake IL, Kane and McHenry Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Fox River from Red Gate Road in St. Charles downstream to Millington, including the Montgomery gauge. * WHEN...Until further notice. * IMPACTS...At 13.5 feet, Low-lying parking lots at city hall and Boy Scout Island are threatened in St. Charles. Fox River Trail is threatened at St. Mary Park in St. Charles. * ADDITIONAL DETAILS... - At 10:00 AM CDT Friday the stage was 13.4 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Friday was 13.5 feet. The river was currently cresting. - Forecast...The river is expected to remain near flood stage for the next several days. - Flood stage is 13.5 feet. - http://www.weather.gov/safety/flood

A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by late tonight.

Flood Warning issued April 17 at 11:24PM CDT by NWS Chicago IL

Effective: Fri April 17, 2026, 11:24 PM
Expires: Sat April 18, 2026, 5:30 PM

...The Flood Warning continues for the following rivers in Illinois... Fox River at Montgomery affecting Kendall and Kane Counties. Fox River at Algonquin Lock & Dam tailwater affecting Lake IL, Kane and McHenry Counties. For the Fox River (Illinois)...including Algonquin Lock & Dam tailwater, Montgomery, Dayton...Moderate flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Fox River from Red Gate Road in St. Charles downstream to Millington, including the Montgomery gauge. * WHEN...Until further notice. * IMPACTS...At 13.5 feet, Low-lying parking lots at city hall and Boy Scout Island are threatened in St. Charles. Fox River Trail is threatened at St. Mary Park in St. Charles. * ADDITIONAL DETAILS... - At 11:00 PM CDT Friday the stage was 13.5 feet. - Forecast...The river will remain near flood stage for the next several days. - Flood stage is 13.5 feet. - http://www.weather.gov/safety/flood

A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by Saturday afternoon.