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

Freeze Watch issued April 18 at 8:35PM CDT until April 20 at 9:00AM CDT by NWS Chicago IL

Effective: Sat April 18, 2026, 8:35 PM
Expires: Sun April 19, 2026, 6:45 AM

* WHAT...For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 28 possible. * WHERE...Portions of central, east central, north central, and northeast Illinois and northwest Indiana. * WHEN...For the Frost Advisory, from midnight CDT /1 AM EDT/ tonight to 9 AM CDT /10 AM EDT/ Sunday. For the Freeze Watch, from late Sunday night through Monday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.

Frost Advisory issued April 18 at 8:35PM CDT until April 19 at 9:00AM CDT by NWS Chicago IL

Effective: Sat April 18, 2026, 8:35 PM
Expires: Sun April 19, 2026, 6:45 AM

* WHAT...For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 28 possible. * WHERE...Portions of central, east central, north central, and northeast Illinois and northwest Indiana. * WHEN...For the Frost Advisory, from midnight CDT /1 AM EDT/ tonight to 9 AM CDT /10 AM EDT/ Sunday. For the Freeze Watch, from late Sunday night through Monday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.

Flood Warning issued April 18 at 12:53PM CDT by NWS Chicago IL

Effective: Sat April 18, 2026, 12:53 PM
Expires: Sun April 19, 2026, 7:00 AM

...The Flood Warning continues for the following rivers in Illinois... Illinois River at Ottawa affecting La Salle County. Illinois River at La Salle affecting La Salle, Putnam and Bureau Counties. For the Illinois River (Upper)...including Morris, Ottawa, La Salle...Minor flooding is forecast. * WHAT...Minor flooding is occurring and forecasted to continue. * WHERE...Illinois River from Starved Rock Lock and Dam downstream to confluence with Big Bureau Creek, including the La Salle gauge. * WHEN...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 11:45 AM CDT Saturday the stage was 21.0 feet. - Forecast...The river is expected to rise to a crest of 23.0 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 Sunday morning.

Flood Warning issued April 18 at 12:53PM CDT until April 20 at 10:00PM CDT by NWS Chicago IL

Effective: Sat April 18, 2026, 12:53 PM
Expires: Sun April 19, 2026, 7:00 AM

...The Flood Warning continues for the following rivers in Illinois... Illinois River at Ottawa affecting La Salle County. Illinois River at La Salle affecting La Salle, Putnam and Bureau Counties. For the Illinois River (Upper)...including Morris, Ottawa, La Salle...Minor flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Illinois River from Heritage Harbor east of Ottawa downstream to Starved Rock Lock and Dam, including the Ottawa gauge. * WHEN...From this evening to late Monday evening. * 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 Saturday the stage was 462.6 feet. - Forecast...The river is expected to rise above flood stage late this evening to a crest of 463.5 feet early tomorrow afternoon. It will then fall below flood stage Monday afternoon. - Flood stage is 463.0 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 Sunday morning.

Flood Warning issued April 18 at 12:41PM CDT until April 21 at 7:00AM CDT by NWS Chicago IL

Effective: Sat April 18, 2026, 12:41 PM
Expires: Sun April 19, 2026, 6:45 AM

...The National Weather Service in Chicago IL has issued a Flood Warning for the following rivers in Illinois... Fox River at Dayton affecting La Salle County. For the Fox River (Illinois)...including Dayton...Minor flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Fox River from Millington downstream to confluence with the Illinois River, including the Dayton gauge. * WHEN...Until Tuesday morning. * IMPACTS...At 13.0 feet, Residential structures threatened along 2062nd Road in Wedron. Water overflows low-lying banks in Dayton and Ottawa. * ADDITIONAL DETAILS... - At 11:45 AM CDT Saturday the stage was 11.7 feet. - Forecast...The river is expected to rise above flood stage this afternoon to a crest of 12.8 feet tomorrow morning. It will then fall below flood stage early Tuesday morning. - Flood stage is 12.0 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 Sunday morning.