Crescent Lake
Crescent Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 14 ft visibility. Phosphorus: 13.1 µg/L.
- Clarity
- 14 ft
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Crescent Lake is a mesotrophic lake in Oneida County, Wisconsin. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 66 other monitored lakes in Oneida County, Crescent Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-04-29. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLow algae
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)
Good clarity, visible to about 14 ft. Phosphorus level: 13.1 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14 ft | Not graded |
| Phosphorus | 13.1 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Crescent Lake
Compare lakeside cabins, hotels, and vacation rentals near Crescent 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 Crescent Lake
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DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Crescent Lake covering fish populations, stocking, water quality, and management. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2022Comprehensive Fisheries Survey of Crescent Lake, 2022Comprehensive Survey · WI DNR · 2022 (PDF)
Recreation & Access
- Crescent Lake SitePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Crescent Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.187 m/yr | 4 |
| Phosphorus | ↑ Improving | -0.41 µg/L/yr | 5 |
EPA Impairment Status
Crescent 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 WI10007843 · Official waterbody report · Matched by proximity (2.22 km)
County Ranking
Ranked #9 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Crescent Lake
Where is Crescent Lake?
- Crescent 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 Crescent Lake?
- Crescent Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 14 ft visibility. Phosphorus: 13.1 µg/L.
Is Crescent Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Crescent Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Are there boat ramps on Crescent Lake?
- Crescent Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Crescent Lake Site. Public access is listed as yes.
Explore Crescent Lake across LakeQuality
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Where this data comes from
75 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX75 samples · 2020–2025
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (2)
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)
Named boat-access points from the USGS National Boat Ramps inventory