Morristown Lake is an earth dam located in Corson County, South Dakota, built in 1938. It carries a Significant hazard potential classification.
Dam profile
NID height · 24 ft24 ft tall and 800 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 Morristown Lake
The primary purpose of Morristown Lake 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-hay Creek near Morristown.
The dam stands 24 feet tall and stretches 800 feet across, creates a reservoir covering 106 acres, has a maximum storage capacity of 1,950 acre-feet, and collects water from a drainage area of 19 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 11/10/2021.
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Location
| State | South Dakota |
| County | Corson |
| Nearest City | Morristown |
| River/Stream | Tr-hay Creek |
| Coordinates | 45.91915, -101.75897 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 800 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 1,950 acre-ft |
| Max Storage | 1,950 acre-ft |
| Normal Storage | 848 acre-ft |
| Surface Area | 106 acres |
| Drainage Area | 19 sq mi |
| Max Discharge | 4,435 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/10/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00745 |
| Federal ID | SD00745 |
| More Info | State Dam Safety Program |