Bancroft is an earth dam located in Kingsbury County, South Dakota, built in 1939. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 270 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 Bancroft
The primary purpose of Bancroft 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 Trib. Marsh Creek.
The dam stands 20 feet tall and stretches 270 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 196 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1939, 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 10/22/2019.
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Location
| State | South Dakota |
| County | Kingsbury |
| Nearest City | None |
| River/Stream | Trib. Marsh Creek |
| Coordinates | 44.49289, -97.70916 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 270 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 196 acre-ft |
| Max Storage | 196 acre-ft |
| Normal Storage | 72 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 1,922 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/22/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02200 |
| Federal ID | SD02200 |
| More Info | State Dam Safety Program |