Moccasin Lake
Moccasin Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 6.4 ft visibility. Phosphorus: 18.7 µg/L. Maximum depth: 19 ft. Surface area: 88 acres.
Wisconsin DNR lists Musky as common on Moccasin Lake. DNR survey details →
- Clarity
- 6.4 ft
- Max depth
- 19 ft
- Area
- 88 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
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Moccasin Lake is a 88-acre mesotrophic lake in Oneida County, Wisconsin with a maximum depth of 19 feet. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. The lake supports 5 documented fish species including Musky, Panfish, and Largemouth Bass. Compared to the 66 other monitored lakes in Oneida County, Moccasin Lake ranks #45 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-11-02. 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 6.4 ft. Phosphorus level: 18.7 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.4 ft | Not graded |
| Phosphorus | 18.7 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Moccasin Lake
Compare lakeside cabins, hotels, and vacation rentals near Moccasin 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 Moccasin Lake
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Wisconsin DNR lists Musky as common on Moccasin Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Moccasin Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 5 years of monitoring is improving. 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 2023).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 19 ft |
| Surface Area | 88 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Moccasin 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: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.05 m/yr | 5 |
| Phosphorus | ↑ Improving | -9.77 µg/L/yr | 4 |
EPA Impairment Status
Moccasin 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 WI10007441 · Official waterbody report · Matched by proximity (1.07 km)
County Ranking
Ranked #45 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Moccasin Lake
Where is Moccasin Lake?
- Moccasin 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 Moccasin Lake?
- Moccasin Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 6.4 ft visibility. Phosphorus: 18.7 µg/L. Maximum depth: 19 ft. Surface area: 88 acres.
Is Moccasin Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Moccasin Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Moccasin Lake?
- Moccasin Lake has a maximum depth of 19 feet. The lake covers 88 acres.
What fish are in Moccasin Lake?
- Fish species found in Moccasin Lake include Musky, Panfish, Largemouth Bass, Northern Pike, Walleye. Moccasin Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Moccasin Lake?
- Wisconsin DNR lists Musky as common on Moccasin Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Moccasin Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 5 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
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Where this data comes from
15 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX15 samples · 2023
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