Tennyson Dam is an earth dam located in Pennington County, South Dakota, built in 1937. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 1,760 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 Tennyson Dam
The primary purpose of Tennyson Dam 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-bad River.
The dam stands 20 feet tall and stretches 1,760 feet across, and has a maximum storage capacity of 535 acre-feet. Completed in 1937, 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.
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Location
| State | South Dakota |
| County | Pennington |
| Nearest City | None |
| River/Stream | Tr-bad River |
| Coordinates | 43.97678, -102.10199 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 1,760 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 535 acre-ft |
| Max Storage | 535 acre-ft |
| Normal Storage | 200 acre-ft |
| Max Discharge | 760 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/01/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01072 |
| Federal ID | SD01072 |
| More Info | State Dam Safety Program |