Rock River Water Reclamation District Excess Flow Basin Dam
Rock River Water Reclamation District Excess Flow Basin Dam is an earth dam located in Winnebago County, Illinois, built in 2016. It carries a High hazard potential classification.
About Rock River Water Reclamation District Excess Flow Basin Dam
Rock River Water Reclamation District Excess Flow Basin Dam is a dam in Winnebago, Illinois. The dam is owned by Rock River Water Reclamation District (public utility). It impounds the Rock River - Offstream near Rockford.
The dam stands 8 feet tall and stretches 2,600 feet across, and has a maximum storage capacity of 42 acre-feet. Completed in 2016, the structure is relatively new.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 07/23/2025.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Illinois dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Winnebago |
| Nearest City | Rockford |
| River/Stream | Rock River - Offstream |
| Coordinates | 42.22778, -89.09861 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 2,600 ft |
| Year Completed | 2016 (10 years old) |
Storage & Hydraulics
| NID Storage | 42 acre-ft |
| Max Storage | 42 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | ROCK RIVER WATER RECLAMATION DISTRICT |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 07/23/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50668 |
| Federal ID | IL50668 |
| More Info | State Dam Safety Program |