W. Mann No.1
W. Mann No.1 is an earth dam located in Meade County, South Dakota, built in 1948. It carries a Low hazard potential classification.
About W. Mann No.1
The primary purpose of W. Mann No.1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Willis Mann (private). It impounds the Tr Cheyenne.
The dam stands 17 feet tall and stretches 540 feet across, and has a maximum storage capacity of 228 acre-feet. Completed in 1948, 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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | South Dakota |
| County | Meade |
| Nearest City | None |
| River/Stream | Tr Cheyenne |
| Coordinates | 44.67166, -102.40999 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 540 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 228 acre-ft |
| Max Storage | 228 acre-ft |
| Normal Storage | 62 acre-ft |
| Max Discharge | 10,000 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | WILLIS MANN |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00384 |
| Federal ID | SD00384 |
| More Info | State Dam Safety Program |