Lake Hanson is an earth dam located in Hanson County, South Dakota, built in 1932. It carries a Low hazard potential classification.
Dam profile
NID height · 24 ft24 ft tall and 780 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 Lake Hanson
The primary purpose of Lake Hanson 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-james.
The dam stands 24 feet tall and stretches 780 feet across, and has a maximum storage capacity of 340 acre-feet. Completed in 1932, 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 11/03/2022.
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Location
| State | South Dakota |
| County | Hanson |
| Nearest City | None |
| River/Stream | Tr-james |
| Coordinates | 43.62511, -97.80544 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 780 ft |
| Year Completed | 1932 (94 years old) |
Storage & Hydraulics
| NID Storage | 340 acre-ft |
| Max Storage | 340 acre-ft |
| Normal Storage | 250 acre-ft |
| Max Discharge | 420 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/03/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00691 |
| Federal ID | SD00691 |
| More Info | State Dam Safety Program |