What is the water quality grade for Round Lake?

Round Lake in Oconto County, Wisconsin received a water quality grade of A (Excellent). Water clarity: 16.8 ft visibility. Phosphorus: 13.8 µg/L. Maximum depth: 31 ft. Surface area: 31 acres.

Is Round Lake safe to swim in?

Excellent for swimming, crystal clear water with minimal algae. Round Lake has an overall water quality grade of A. Always check local health department advisories before swimming.

How deep is Round Lake?

Round Lake has a maximum depth of 31 feet. The lake covers 31 acres.

What fish are in Round Lake?

Fish species found in Round Lake include Panfish. Round Lake is located in Oconto County, Wisconsin.

Round Lake

Oconto County, WisconsinOligotrophic

Round Lake earns an A — every scored parameter (clarity and phosphorus) rates among the best monitored waters in Oconto County. clarity and phosphorus rate similarly, so there is no obvious single lever to pull on watershed management.

Trophically, Round Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. A maximum depth of 31 ft puts Round Lake in the middle of Wisconsin's depth distribution. Round Lake is small — 31 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Among the 62 graded lakes in Oconto County, Round Lake ranks 1 — in the top quartile locally.

Eurasian watermilfoil is established at Round Lake, which can dampen recreational access and pressure the native plant community. The lake's fish records list 1 species — a varied community without one dominant gamefish. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2021-10-28. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated May 31, 2026