Little Moreau #1 is an earth dam located in Dewey County, South Dakota, built in 1933. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 662 ft long, taller than 68% 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 Little Moreau #1
The primary purpose of Little Moreau #1 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 Little Moreau River.
The dam stands 30 feet tall and stretches 662 feet across, creates a reservoir covering 33 acres, has a maximum storage capacity of 507 acre-feet, and collects water from a drainage area of 51 square miles. Completed in 1933, 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 10/04/2018.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | South Dakota |
| County | Dewey |
| Nearest City | None |
| River/Stream | Little Moreau River |
| Coordinates | 45.34768, -101.08918 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 662 ft |
| Year Completed | 1933 (93 years old) |
Storage & Hydraulics
| NID Storage | 507 acre-ft |
| Max Storage | 507 acre-ft |
| Normal Storage | 211 acre-ft |
| Surface Area | 33 acres |
| Drainage Area | 51 sq mi |
| Max Discharge | 8,616 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Gf&p |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/04/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00015 |
| Federal ID | SD00015 |
| More Info | State Dam Safety Program |