Grieves Dam is an earth dam located in Fulton County, Illinois, built in 1998. It carries a Significant hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 430 ft long, taller than 62% of U.S. dams with a recorded height. 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 Grieves Dam
The primary purpose of Grieves Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lowell Grieves (private). It impounds the Trib Illinois River.
The dam stands 28 feet tall and stretches 430 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 86 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1998, the structure is 28 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 03/31/2023.
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Location
| State | Illinois |
| County | Fulton |
| Nearest City | None |
| River/Stream | Trib Illinois River |
| Coordinates | 40.49291, -89.94078 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 430 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 86 acre-ft |
| Max Storage | 86 acre-ft |
| Normal Storage | 45 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lowell Grieves |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 03/31/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50395 |
| Federal ID | IL50395 |
| More Info | State Dam Safety Program |