Round Lake
Waushara County, WisconsinLimited DataMesotrophic
On the LakeGrade scale Round Lake grades a B, with clarity at 12.5 ft and phosphorus readings still being added placing it above the Wisconsin median. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.
The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. A maximum depth of 19 ft puts Round Lake in the middle of Wisconsin's depth distribution. The lake is compact at 74 acres, with partial shoreline records and little volume to buffer nutrient inputs. Within Waushara County's 32 graded lakes, Round Lake ranks 20 — below the local median, though not at the bottom.
Eurasian watermilfoil is established at Round Lake, which can dampen recreational access and pressure the native plant community. Walleye are documented at Round Lake, one of 4 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. 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 2025-11-11. Grade methodology: LakeGrade methodology.
Watch Round Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 12.5 ft. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.5 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 19 ft |
| Surface Area | 74 acres |
| Public Access | Yes |
Fish Species
Click a species to see every graded lake where it is documented.
→ Best fishing times for Round Lake (14-day solunar calendar)
→ Is it safe to eat fish from Round Lake? (mercury & PFAS guide)
→ Round Lake fishing regulations (limits, seasons, special rules)
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.205 m/yr | 7 |
| Phosphorus | ↓ Declining | +0.81 µg/L/yr | 6 |
Recreation & Access
Location
County Ranking
Ranked #20 of 32 lakes in Waushara County
Cleaner Lakes Within 30 Miles
Round Lake holds Grade B. 5 nearby lakes hold higher grades.
Nearby Lakes in Waushara County
More Wisconsin Lake Rankings
State Parks Near Round Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Fish and recreation data from Wisconsin DNR Lakes
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2025-11-11
Monitoring stations: 1
Where to stay near Round Lake
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