Williams Dam
Williams Dam is an earth dam located in Fall River County, South Dakota, built in 1935. It carries a Low hazard potential classification.
About Williams Dam
The primary purpose of Williams Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Gf&p (state). It impounds the Day Creek.
The dam stands 15 feet tall and stretches 750 feet across, and has a maximum storage capacity of 135 acre-feet. Completed in 1935, 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 12/14/2023.
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Location
| State | South Dakota |
| County | Fall River |
| Nearest City | None |
| River/Stream | Day Creek |
| Coordinates | 43.14945, -103.32888 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 750 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 135 acre-ft |
| Max Storage | 135 acre-ft |
| Normal Storage | 99 acre-ft |
| Max Discharge | 286 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | GF&P |
| Owner Type | State |
| Hazard Classification | Low |
| Last Inspection | 12/14/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00646 |
| Federal ID | SD00646 |
| More Info | State Dam Safety Program |