Round Lake
Round Lake in Oconto County, Wisconsin has a water quality grade of B (Good). Water clarity: 16.8 ft visibility. Phosphorus: 13.8 µg/L. Maximum depth: 31 ft. Surface area: 31 acres.
- Clarity
- 16.8 ft
- Max depth
- 31 ft
- Area
- 31 acres
- Type
- Oligotrophic
- Trend
- → Stable
- Public access
- Yes
Next lake in Oconto County
Round Lake is a 31-acre cold, clear oligotrophic lake in Oconto County, Wisconsin with a maximum depth of 31 feet. Water quality is graded B based on 1 sampling years through 2021. The lake supports 1 documented fish species including Panfish. Public access is available with 4 public boat landings. Compared to the 38 other monitored lakes in Oconto County, Round Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2021-10-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Crystal clear, you can see 16.8 ft down. Phosphorus level: 13.8 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16.8 ft | Not graded |
| Phosphorus | 13.8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Round Lake
Compare lakeside cabins, hotels, and vacation rentals near Round Lake in Oconto County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 31 ft |
| Surface Area | 31 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Leigh Flowage (Ed Tank )Public
- Kelly Lake # 4Public
- Kelly Lake # 5Public
- Round LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Round Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2022).
Fish Species (DNR-rated)
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.223 m/yr | 7 |
| Phosphorus | → Stable | -0.21 µg/L/yr | 7 |
County Ranking
Ranked #3 of 39 lakes in Oconto County
Nearby Lakes in Oconto County
Frequently asked questions about Round Lake
What is the water quality grade for Round Lake?
- Round Lake in Oconto County, Wisconsin has a water quality grade of B (Good). 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?
- Good for swimming, clear water with low algae levels. Round Lake has a water quality grade of B (Good). 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.
Are there boat ramps on Round Lake?
- Round Lake has 4 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Leigh Flowage (Ed Tank ), Kelly Lake # 4, Kelly Lake # 5, Round Lake. Public access is listed as yes.
Explore Round Lake across LakeGrade
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Species activity outlook by water temperature and season
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Low nutrients, clear water, excellent for swimming
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Other Grade B Lakes in Wisconsin
Oligotrophic Lakes in Wisconsin
Where this data comes from
14 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX14 samples · 2020–2021
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory