River stage
Byron, Rock River
- River level
- 7.35 ft
- Status
- Below flood stage
- 7-day change
- -1.15 ft
- Recent high
- 10.19 ft
- Recent low
- 5.43 ft
Last reported 2026-10-13 | NWS BYRI2
- 30-day change
- +1.83 ft
- Average
- 6.81 ft
- Readings
- 122
- Data span
- 122 days
- Record crest
- 17.80 ft
In brief
The Rock River at Byron, IL read 7.35 ft on Oct 13, 2026, 3.15 ft below action stage. That is 1.83 ft higher than 30 days earlier.
Source: National Weather Service gauge BYRI2
Water 66 °F (19 °C) · 8 °F warmer than normal for this date · +4 °F in 24 hours
River level timeline
Stage threshold profile
Highest crests on record
| Rank | Crest | Date |
|---|---|---|
| 1 | 17.80 ft | 1973-04-20 |
| 2 | 17.08 ft | 2013-04-20 |
| 3 | 16.64 ft | 2019-03-16 |
| 4 | 16.50 ft | 2010-07-25 |
| 5 | 16.12 ft | 2000-06-14 |
| 6 | 15.67 ft | 2018-10-08 |
| 7 | 15.52 ft | 2007-08-25 |
| 8 | 15.38 ft | 2017-07-22 |
Flood crests recorded at this gauge by the National Weather Service.
What happens at each level
- 10.50 ft
Water begins to affect low-lying areas along the river near Byron.
- 12.00 ft
Water inundates yards of several houses along River Road near Byron. Low-lying portions of Hamas Park and Sunshine Park are inundated.
- 13.00 ft
Low-lying structures downstream of Byron are threatened.
- 13.50 ft
Numerous low-lying structures downstream of Byron are flooded.
- 15.50 ft
Water threatens lower sections of the water treatment plant property in Byron. Water threatens IL-2 west of Byron.
- 16.00 ft
The MercyHealth Clinic is threatened along Kysor Drive in Byron.
- 16.50 ft
Numerous residences are threatened between IL-2 and the river just northeast of Byron. River Road is threatened near the river just south of Byron.
- 17.00 ft
Water threatens structures at the water treatment plant in Byron.
Written by the local National Weather Service forecast office for this exact gauge.
Frequently asked questions
Is the Rock River flooding at Byron?
No. The Rock River at Byron is at 7.35 ft, 3.15 ft below action stage.
What is the flood stage at Byron?
The National Weather Service sets action stage 10.5 ft, minor flooding 13 ft, moderate flooding 14 ft and major flooding 16 ft.
What is the highest the Rock River has been at Byron?
The highest crest on record is 17.8 ft, on 1973-04-20.
Is the Rock River high or low right now at Byron?
At 7.35 ft it is higher than 63% of readings over the last 122 days.
How warm is the water at Byron, Rock River?
The water temperature at Byron, Rock River is 66 °F (18.9 °C), measured 9:15 pm by USGS, which is 8 °F warmer than normal for this date over the past ten years. It has risen 3.6 °F in the last 24 hours.
Stage and flood information from the NOAA National Weather Service (gauge BYRI2); daily history from the U.S. Geological Survey (site 05440700). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.