Splitrock Lake

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 82% of dams nationwide.

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