Larsen Lyman 1
Larsen Lyman 1 is an earth dam located in Pennington County, South Dakota, built in 1958. It carries a Low hazard potential classification.
About Larsen Lyman 1
The primary purpose of Larsen Lyman 1 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Walter E. Witcher (private). It impounds the Tr Cheyenne.
The dam stands 23 feet tall and stretches 300 feet across, and has a maximum storage capacity of 120 acre-feet. Completed in 1958, the structure is well into its service life at over 50 years old.
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.
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Location
| State | South Dakota |
| County | Pennington |
| Nearest City | None |
| River/Stream | Tr Cheyenne |
| Coordinates | 43.82999, -102.46666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 300 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 120 acre-ft |
| Max Storage | 120 acre-ft |
| Normal Storage | 90 acre-ft |
| Max Discharge | 625 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | WALTER E. WITCHER |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01922 |
| Federal ID | SD01922 |
| More Info | State Dam Safety Program |