Grey Cloud Slough Lake

On the LakeGrade rubric Grey Cloud Slough Lake fails the cutoffs — a TSI of 60 and persistent algal pressure put it in the bottom tier.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Grey Cloud Slough Lake ranks 31 of 31 in Washington County — at the lower end of the locally monitored distribution.

Grey Cloud Slough Lake is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. The state fisheries records do not list documented species for Grey Cloud Slough Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Grey Cloud Slough Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.