New Wall Lake is an earth dam located in Pennington County, South Dakota, built in 1947. It carries a Low hazard potential classification.
Dam profile
NID height · 40 ft40 ft tall and 570 ft long, taller than 86% of U.S. dams with a recorded height. 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 New Wall Lake
The primary purpose of New Wall 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-cheyenne.
The dam stands 40 feet tall and stretches 570 feet across, and has a maximum storage capacity of 460 acre-feet. Completed in 1947, 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 11/01/2023.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | South Dakota |
| County | Pennington |
| Nearest City | None |
| River/Stream | Tr-cheyenne |
| Coordinates | 43.98166, -102.28166 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 570 ft |
| Year Completed | 1947 (79 years old) |
Storage & Hydraulics
| NID Storage | 460 acre-ft |
| Max Storage | 460 acre-ft |
| Normal Storage | 280 acre-ft |
| Max Discharge | 1,365 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Gf&p |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/01/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01071 |
| Federal ID | SD01071 |
| More Info | State Dam Safety Program |