City of Murdo Number #1 is an earth dam located in Jones County, South Dakota, built in 1938. It carries a Significant hazard potential classification.
Dam profile
NID height · 42 ft42 ft tall and 1,100 ft long, taller than 88% 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 City of Murdo Number #1
The primary purpose of City of Murdo Number #1 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City of Murdo (local government). It impounds the Tr-bad River.
The dam stands 42 feet tall and stretches 1,100 feet across, creates a reservoir covering 55 acres, has a maximum storage capacity of 1,740 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1938, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 05/14/1981. That was over 45 years ago.
At 42 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | South Dakota |
| County | Jones |
| Nearest City | None |
| River/Stream | Tr-bad River |
| Coordinates | 43.92230, -100.72215 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 39 ft |
| Dam Length | 1,100 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 1,740 acre-ft |
| Max Storage | 1,740 acre-ft |
| Normal Storage | 825 acre-ft |
| Surface Area | 55 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 7,300 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Murdo |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/14/1981 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00142 |
| Federal ID | SD00142 |
| More Info | State Dam Safety Program |