Round Lake
Round Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 4.4 ft visibility. Phosphorus: 20.9 µg/L. Maximum depth: 15 ft. Surface area: 151 acres.
Wisconsin DNR lists Musky as common on Round Lake. DNR survey details →
- Clarity
- 4.4 ft
- Typical in July
- 68°F
- Max depth
- 15 ft
- Area
- 151 acres
- Type
- Eutrophic
- Trend
- → Stable
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Round Lake is a 151-acre productive, nutrient-rich eutrophic lake in Oneida County, Wisconsin with a maximum depth of 15 feet. Water quality is graded B based on 1 sampling years through 2026. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Compared to the 66 other monitored lakes in Oneida County, Round Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-02-24. Grade methodology: LakeQuality 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)
Murky, only visible to about 4.4 ft. Phosphorus level: 20.9 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.4 ft | Not graded |
| Phosphorus | 20.9 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Round Lake
Compare lakeside cabins, hotels, and vacation rentals near Round Lake in Oneida 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.
Top-rated places to stay near Round Lake
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Water Temperature
Round Lake typically sits around 68°F at the surface in July. Summer average is about 68°F. Usually warmest in Jun (about 68°F) and coldest in Feb (about 37°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 14 field readings (2025–2026) via the EPA Water Quality Portal. See the full Round Lake water temperature breakdown →
Wisconsin DNR lists Musky as common on Round Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Round Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2026).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 15 ft |
| Surface Area | 151 acres |
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.
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.025 m/yr | 7 |
EPA Impairment Status
Round Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10007418 · Official waterbody report
County Ranking
Ranked #2 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Round Lake
Where is Round Lake?
- Round Lake is a lake in Oneida County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Round Lake?
- Round Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 4.4 ft visibility. Phosphorus: 20.9 µg/L. Maximum depth: 15 ft. Surface area: 151 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.
What is the water temperature of Round Lake?
- Round Lake typically sits around 68°F at the surface in July, from 14 EPA Water Quality Portal field readings (2025–2026). That is a typical value for the month, not a live reading.
How deep is Round Lake?
- Round Lake has a maximum depth of 15 feet. The lake covers 151 acres.
What fish are in Round Lake?
- Fish species found in Round Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Round Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Round Lake?
- Wisconsin DNR lists Musky as common on Round Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Round Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Explore Round Lake across LakeQuality
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Where this data comes from
18 measurements from 1 monitoring station, 2025–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX18 samples · 2025–2026
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes