Belvidere Dam is an other dam located in Boone County, Illinois, built in 1865. It carries a Low hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 853 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Belvidere Dam
Belvidere Dam is a dam in Boone, Illinois. The dam is owned by Illinois Department of Natural Resources (state). It impounds the Kishwaukee River near Belvidere.
The dam stands 10 feet tall and stretches 853 feet across, creates a reservoir covering 95 acres, has a maximum storage capacity of 750 acre-feet, and collects water from a drainage area of 538 square miles. Completed in 1865, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 08/08/2025.
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Location
| State | Illinois |
| County | Boone |
| Nearest City | Belvidere |
| River/Stream | Kishwaukee River |
| Coordinates | 42.25452, -88.85191 |
Physical Characteristics
| Dam Type | Other |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 853 ft |
| Year Completed | 1865 (161 years old) |
Storage & Hydraulics
| NID Storage | 750 acre-ft |
| Max Storage | 750 acre-ft |
| Normal Storage | 220 acre-ft |
| Surface Area | 95 acres |
| Drainage Area | 538 sq mi |
| Max Discharge | 9,080 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Illinois Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/08/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50003 |
| Federal ID | IL50003 |
| More Info | State Dam Safety Program |