Gardner Lake Dam
Gardner Lake Dam is an earth dam located in Harding County, South Dakota, built in 1948. It carries a High hazard potential classification and has a fair condition assessment.
About Gardner Lake Dam
The primary purpose of Gardner Lake 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 Tr-s Fork Grand River.
The dam stands 32 feet tall and stretches 1,050 feet across, creates a reservoir covering 190 acres, has a maximum storage capacity of 3,726 acre-feet, and collects water from a drainage area of 22 square miles. Completed in 1948, the structure is well-established, with more than 75 years of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 11/10/2021.
At 32 feet, this dam is taller than 76% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The South Dakota dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | South Dakota |
| County | Harding |
| Nearest City | None |
| River/Stream | Tr-s Fork Grand River |
| Coordinates | 45.60622, -103.60824 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 1,050 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 3,726 acre-ft |
| Max Storage | 3,726 acre-ft |
| Normal Storage | 1,753 acre-ft |
| Surface Area | 190 acres |
| Drainage Area | 22 sq mi |
| Max Discharge | 9,825 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | GF&P |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 11/10/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | SD00617 |
| Federal ID | SD00617 |
| More Info | State Dam Safety Program |