Shad Lake Dam is a rockfill dam located in Macoupin County, Illinois, built in 1950. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 450 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic rockfill embankment section and the water level is illustrative.
About Shad Lake Dam
The primary purpose of Shad Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Village of Royal Lakes (local government). It impounds the Coop Branch.
The dam stands 20 feet tall and stretches 450 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 160 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1950, the structure is well-established, with more than 75 years 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 08/02/2024.
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Location
| State | Illinois |
| County | Macoupin |
| Nearest City | None |
| River/Stream | Coop Branch |
| Coordinates | 39.11132, -89.96963 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 450 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 160 acre-ft |
| Max Storage | 160 acre-ft |
| Normal Storage | 48 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 2,011 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Village of Royal Lakes |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/02/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL01051 |
| Federal ID | IL01051 |
| More Info | State Dam Safety Program |