Crystal Lake
Crystal Lake in Oneida County, Wisconsin has a water quality grade of D (Nutrient-rich). Water clarity: 2.5 ft visibility. Phosphorus: 47.4 µg/L. Maximum depth: 9 ft. Surface area: 116 acres.
Wisconsin DNR lists Northern Pike as common on Crystal Lake. DNR survey details →
- Clarity
- 2.5 ft
- Max depth
- 9 ft
- Area
- 116 acres
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Crystal Lake →
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Crystal Lake is a 116-acre productive, nutrient-rich eutrophic lake in Oneida County, Wisconsin with a maximum depth of 9 feet. Water quality is graded D 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. Public access is available with 2 public boat landings. Compared to the 66 other monitored lakes in Oneida County, Crystal Lake ranks #64 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-08-31. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyElevated nutrients
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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 2.5 ft of visibility. Phosphorus level: 47.4 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | Not graded |
| Phosphorus | 47.4 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Crystal Lake
Compare lakeside cabins, hotels, and vacation rentals near Crystal 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Crystal Lake are listed below.
Top-rated places to stay near Crystal Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Wisconsin DNR lists Northern Pike as common on Crystal Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Crystal Lake D from EPA Water Quality Portal chemistry, and the water-quality trend over 4 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 | 9 ft |
| Surface Area | 116 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Big LakePublic
- Mud LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Crystal 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 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.52 m/yr | 4 |
| Phosphorus | ↑ Improving | -9.44 µg/L/yr | 4 |
EPA Impairment Status
Crystal 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 WI10007385 · Official waterbody report · Matched by proximity (0.04 km)
County Ranking
Ranked #64 of 67 lakes in Oneida County
Nearby Lakes With Higher Grades
Crystal Lake holds Grade D. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Oneida County
Frequently asked questions about Crystal Lake
Where is Crystal Lake?
- Crystal Lake is a lake in Oneida County, Wisconsin. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Crystal Lake?
- Crystal Lake in Oneida County, Wisconsin has a water quality grade of D (Nutrient-rich). Water clarity: 2.5 ft visibility. Phosphorus: 47.4 µg/L. Maximum depth: 9 ft. Surface area: 116 acres.
Is Crystal Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Crystal Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
How deep is Crystal Lake?
- Crystal Lake has a maximum depth of 9 feet. The lake covers 116 acres.
What fish are in Crystal Lake?
- Fish species found in Crystal Lake include Musky, Panfish, Largemouth Bass, Northern Pike, Walleye. Crystal Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Crystal Lake?
- Wisconsin DNR lists Northern Pike as common on Crystal Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Crystal Lake D from EPA Water Quality Portal chemistry, and the water-quality trend over 4 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Crystal Lake?
- Crystal Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Big Lake, Mud Lake. Public access is listed as yes.
Explore Crystal Lake across LakeQuality
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Where this data comes from
26 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX26 samples · 2020–2023
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
Named boat-access points from the USGS National Boat Ramps inventory