Crystal Bog Lake
Vilas County, Wisconsin1 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Crystal Bog Lake. Here is what has been measured.
- Mesotrophic
- 8 ft max depth
- Public access
- Limited data
Crystal Bog Lake in Vilas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Phosphorus: 12.5 µg/L. Maximum depth: 8 ft. Surface area: 1 acres.
Crystal Bog Lake is a 1-acre mesotrophic lake in Vilas County, Wisconsin with a maximum depth of 8 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available. 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. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Crystal Bog Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Crystal Bog Lake
These are the measurements Wisconsin DNR publishes for Crystal Bog Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 12.5 µg/L. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 12.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Crystal Bog Lake
Answers come straight from the public measurements and survey records on this page.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).
Lake Details
Max depth
8 ft
Surface area
1 acres
Public access
Yes
Listed by Wisconsin DNR
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Fishing Crystal Bog Lake
Water quality readings over time
3 seasons of samples on record (2020–2022). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Improving-4.85 µg/L/yr3 years
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. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Crystal Bog Lake?
- Crystal Bog Lake in Vilas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Phosphorus: 12.5 µg/L. Maximum depth: 8 ft. Surface area: 1 acres.
Is Crystal Bog Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Crystal Bog Lake?
- Crystal Bog Lake has a maximum depth of 8 feet. The lake covers 1 acres.
Can I fish at Crystal Bog Lake?
- Public access to Crystal Bog Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Fish and recreation data from Wisconsin DNR Lakes