Sullivan Lake

On the scoring rubric Sullivan Lake grades a D: clarity at 6.0 ft and phosphorus readings still being added keep it in the lower bracket for Wright County.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. At 58 ft of maximum depth, Sullivan Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. The lake is compact at 71 acres, with 1.7 miles of shoreline and little volume to buffer nutrient inputs. Within Wright County's 64 graded lakes, Sullivan Lake ranks 37 — below the local median, though not at the bottom.

Sullivan Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The fishery is panfish-dominated — bluegill, crappie, and sunfish among the 11 species documented for the lake. A documented public access point at Sullivan 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.