Split Rock Lighthouse State Park / Corundum Point Beach is a freshwater beach in Lake County, Minnesota. Across 27 bacteria samples collected between 2021 and 2025 at nearby monitoring stations, it earns a Beach Safety Grade of A — Excellent.
About 0.0% of samples at Split Rock Lighthouse State Park / Corundum Point Beach exceeded the EPA Beach Action Value of 235 CFU/100 mL for Escherichia coli — the threshold at which water managers typically post a swimming advisory. In practice that means the safe-swimming limit was almost never crossed here over the monitored period. Bacteria samples almost never exceed the safe-swimming threshold.
Split Rock Lighthouse State Park / Corundum Point Beach was not under a swimming advisory in the most recent EPA snapshot. Conditions can change quickly after heavy rain or high runoff, so it's still worth checking the current advisory the day you go.
📍 47.1960, -91.3750 · Open in Google Maps. Coordinates mark the monitored shoreline, not a specific access point.
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Where to stay near Split Rock Lighthouse State Park / Corundum Point Beach
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Common questions
Frequently Asked Questions
Split Rock Lighthouse State Park / Corundum Point Beach earns a Beach Safety Grade of A (Excellent), based on 27 bacteria samples where about 0.0% exceeded the EPA safe-swimming threshold. Always confirm the current advisory before swimming, especially after heavy rain.
Water samples near Split Rock Lighthouse State Park / Corundum Point Beach are tested for Escherichia coli, uploaded to the EPA Water Quality Portal. A sample above the Beach Action Value (235 CFU/100 mL) signals a higher risk of illness from swimming. BeachGrade summarizes multiple years of those results into one grade.
Split Rock Lighthouse State Park / Corundum Point Beach is a freshwater beach in Lake County, Minnesota.
Beach inventory and advisory status from the U.S. EPA BEACON program; bacteria samples from the Water Quality Portal. The Beach Safety Grade summarizes multiple years of monitoring — see our methodology. Water quality changes quickly, especially after rain; always check the official state or county advisory before swimming. BeachGrade is informational and not a substitute for official public-health guidance.