Crystal Bog Lake
Crystal Bog Lake in Vilas County, Wisconsin has a water quality grade of B (Good). Phosphorus: 12.5 µg/L. Maximum depth: 8 ft. Surface area: 1 acres.
- Max depth
- 8 ft
- Area
- 1 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Crystal Bog Lake is a 1-acre mesotrophic lake in Vilas County, Wisconsin with a maximum depth of 8 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 102 other monitored lakes in Vilas County, Crystal Bog Lake ranks #82 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-05-14. 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)
No clarity data. Phosphorus level: 12.5 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 12.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Crystal Bog Lake
Compare lakeside cabins, hotels, and vacation rentals near Crystal Bog Lake in Vilas 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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WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 8 ft |
| Surface Area | 1 acres |
| Public Access | Yes |
Recreation & Access
- Crystal LakePublic
- Big Muskellunge CampgroundPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Crystal Bog 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.
Source: USGS Nonindigenous Aquatic Species (NAS) Database. Hover a chip to see scientific name, ecological context, status, and first-observed year.
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -4.85 µg/L/yr | 3 |
County Ranking
Ranked #82 of 103 lakes in Vilas County
Nearby Lakes in Vilas County
Frequently asked questions about Crystal Bog Lake
Where is Crystal Bog Lake?
- Crystal Bog Lake is a lake in Vilas County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Crystal Bog Lake?
- Crystal Bog Lake in Vilas County, Wisconsin has a water quality grade of B (Good). Phosphorus: 12.5 µg/L. Maximum depth: 8 ft. Surface area: 1 acres.
Is Crystal Bog Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Crystal Bog Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Crystal Bog Lake?
- Crystal Bog Lake has a maximum depth of 8 feet. The lake covers 1 acres.
Are there boat ramps on Crystal Bog Lake?
- Crystal Bog Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Crystal Lake, Big Muskellunge Campground. Public access is listed as yes.
Explore Crystal Bog Lake across LakeQuality
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Where this data comes from
14 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX14 samples · 2020–2026
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
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory