Sherwood Forest Lake Dam is an earth dam located in Clark County, Illinois, built in 1954. It carries a Significant hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 445 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 Sherwood Forest Lake Dam
The primary purpose of Sherwood Forest Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Walter Crowder, Jr. (private). It impounds the Trib Willis Branch near Martinsville.
The dam stands 21 feet tall and stretches 445 feet across, and has a maximum storage capacity of 96 acre-feet. Completed in 1954, the structure is well into its service life at over 50 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. The most recent inspection on record was 06/28/2023.
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Location
| State | Illinois |
| County | Clark |
| Nearest City | Martinsville |
| River/Stream | Trib Willis Branch |
| Coordinates | 39.37151, -87.94019 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 445 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 96 acre-ft |
| Max Storage | 96 acre-ft |
| Normal Storage | 53 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Walter Crowder, Jr. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 06/28/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00684 |
| Federal ID | IL00684 |
| More Info | State Dam Safety Program |