Splitrock Lake is a rockfill dam located in Pipestone County, Minnesota, built in 1937. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 35 ft35 ft tall and 300 ft long, taller than 80% 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 rockfill embankment section and the water level is illustrative.
About Splitrock Lake
The primary purpose of Splitrock Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mndnr-parks (state). It impounds the Split Rock Creek-tr near Jasper.
The dam stands 35 feet tall and stretches 300 feet across, creates a reservoir covering 80 acres, has a maximum storage capacity of 540 acre-feet, and collects water from a drainage area of 31 square miles. Completed in 1937, 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 09/08/2022.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Minnesota |
| County | Pipestone |
| Nearest City | Jasper |
| River/Stream | Split Rock Creek-tr |
| Coordinates | 43.89203, -96.36580 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 300 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 540 acre-ft |
| Max Storage | 540 acre-ft |
| Normal Storage | 360 acre-ft |
| Surface Area | 80 acres |
| Drainage Area | 31 sq mi |
| Max Discharge | 3,000 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Mndnr-parks |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/08/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00100 |
| Federal ID | MN00100 |
| More Info | State Dam Safety Program |