Station Name: ROCK RIVER AT BYRON, IL
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 679 feet

Nearest Address:
State Rte 72
Byron, IL 61010
Ogle County

GPS Coordinates: 42.12218889, -89.2553639

Nearby Water Temperatures

Flood Warning issued May 5 at 9:55AM CDT until May 8 at 7:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Tue May 5, 2026, 9:55 AM
Expires: Tue May 5, 2026, 10:00 PM

...The Flood Warning is extended for the following rivers in Illinois...Wisconsin... Rock River At Afton affecting Winnebago and Rock Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until Friday morning. * 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 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 8:00 AM CDT Tuesday was 9.5 feet. - Forecast...The river is expected to fall below flood stage early Friday morning and continue falling to 8.0 feet Tuesday, May 12. - 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 evening at 1000 PM CDT.

Flood Warning issued May 5 at 4:04PM CDT until May 8 at 7:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Tue May 5, 2026, 4:04 PM
Expires: Wed May 6, 2026, 4:15 AM

...The Flood Warning continues for the following rivers in Illinois...Wisconsin... Rock River At Afton affecting Winnebago and Rock Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until Friday morning. * 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 3:00 PM 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 3:00 PM CDT Tuesday was 9.5 feet. - Forecast...The river is expected to fall below flood stage early Friday morning and continue falling to 8.0 feet Tuesday, May 12. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 9.3 feet on 05/02/1921. - 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 late tonight at 415 AM CDT.

Frost Advisory issued May 5 at 1:13PM CDT until May 6 at 8:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Tue May 5, 2026, 1:13 PM
Expires: Tue May 5, 2026, 9:15 PM

* WHAT...Temperatures in the low 30s will result in frost formation, especially in low-lying areas. * WHERE...Portions of east central, south central, and southeast Wisconsin. * WHEN...From 1 AM to 8 AM CDT Wednesday. * IMPACTS...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 May 5 at 9:56AM CDT until May 6 at 7:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Tue May 5, 2026, 9:56 AM
Expires: Tue May 5, 2026, 10:00 PM

...The Flood Warning continues for the following rivers in Wisconsin... Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until tomorrow morning. * 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 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 8:00 AM CDT Tuesday was 10.2 feet. - Forecast...The river is expected to fall below flood stage just after midnight tonight and continue falling to 8.8 feet Tuesday, May 12. - 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 evening at 1000 PM CDT.

Flood Warning issued May 5 at 4:05PM CDT until May 6 at 7:00AM CDT by NWS Milwaukee/Sullivan WI

Effective: Tue May 5, 2026, 4:05 PM
Expires: Wed May 6, 2026, 4:15 AM

...The Flood Warning continues for the following rivers in Wisconsin... Rock River Near Lake Koshkonong affecting Jefferson and Rock Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until tomorrow morning. * 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 3:00 PM CDT Tuesday the stage was 10.0 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Tuesday was 10.2 feet. - Forecast...The river is expected to fall below flood stage just after midnight tonight and continue falling to 8.8 feet Tuesday, May 12. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.0 feet on 06/30/2013. - 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 late tonight at 415 AM CDT.