Herrick Lake
Herrick Lake is an earth dam located in Gregory County, South Dakota, built in 1937. It carries a Low hazard potential classification.
About Herrick Lake
The primary purpose of Herrick Lake 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 Tr-ponca Creek.
The dam stands 20 feet tall and stretches 1,000 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 255 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1937, 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 10/25/2023.
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Location
| State | South Dakota |
| County | Gregory |
| Nearest City | None |
| River/Stream | Tr-ponca Creek |
| Coordinates | 43.09683, -99.20171 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 255 acre-ft |
| Max Storage | 255 acre-ft |
| Normal Storage | 150 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 860 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | GF&P |
| Owner Type | State |
| Hazard Classification | Low |
| Last Inspection | 10/25/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00549 |
| Federal ID | SD00549 |
| More Info | State Dam Safety Program |