Molstad Lake is an earth dam located in Walworth County, South Dakota, built in 1940. It carries a Low hazard potential classification.
Dam profile
NID height · 19 ft19 ft tall and 2,080 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 Molstad Lake
The primary purpose of Molstad Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by S&pl (state). It impounds the Tr Missouri.
The dam stands 19 feet tall and stretches 2,080 feet across, creates a reservoir covering 111 acres, has a maximum storage capacity of 2,080 acre-feet, and collects water from a drainage area of 24 square miles. Completed in 1940, 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 10/21/2022.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | South Dakota |
| County | Walworth |
| Nearest City | None |
| River/Stream | Tr Missouri |
| Coordinates | 45.56130, -100.30096 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 2,080 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 2,080 acre-ft |
| Max Storage | 2,080 acre-ft |
| Normal Storage | 623 acre-ft |
| Surface Area | 111 acres |
| Drainage Area | 24 sq mi |
| Max Discharge | 11,985 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/21/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00755 |
| Federal ID | SD00755 |
| More Info | State Dam Safety Program |