Little Horseshoe Lake

Little Horseshoe Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Minnesota norms.

Mesotrophic conditions dominate at Little Horseshoe Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake bottoms out at 43 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Little Horseshoe Lake is small — 49 acres alongside 1.4 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Within Chisago County's 31 graded waters, Little Horseshoe Lake sits at rank 7, near the top of the local distribution.

Eurasian watermilfoil is established at Little Horseshoe Lake, which can dampen recreational access and pressure the native plant community. The state fisheries records do not list documented species for Little Horseshoe Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Little Horseshoe Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is supported by multiple sampling years from Minnesota PCA volunteers and partner agencies, giving the letter a reasonably stable foundation.