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LakeQuality
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Crawling Stone Lake

Vilas County, WisconsinOligotrophic

Crawling Stone Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Vilas County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI value of 29 puts Crawling Stone Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. Crawling Stone Lake is unusually deep for Wisconsin at 87 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. At 1,483 acres, Crawling Stone Lake is one of the larger lakes in Vilas County, with partial shoreline records supporting multiple distinct use patterns. Crawling Stone Lake ranks 87 of 202 in Vilas County — solidly in the upper half of the local distribution.

Crawling Stone Lake has at least one documented invasive species (Rusty Crayfish), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. The fishery includes walleye alongside the lake's other 6 documented species — a notable draw for Wisconsin anglers. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-06-24. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 52.5 ft down. Phosphorus level: 10.2 µg/L. Trophic State Index: 29.

MetricValueGrade
Water Clarity (Secchi Depth)52.5 ftA
Phosphorus10.2 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)29Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth87 ft
Surface Area1.5K acres

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Crawling Stone Lake (14-day solunar calendar)

→ Is it safe to eat fish from Crawling Stone Lake? (mercury & PFAS guide)

Crawling Stone Lake fishing regulations (limits, seasons, special rules)

Invasive Species

Rusty Crayfish

Water Quality Trend: Stable

Based on 7 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.464 m/yr7
Phosphorus Improving-0.93 µg/L/yr5
See year-by-year chart →

Location

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County Ranking

Ranked #87 of 202 lakes in Vilas County

Nearby Lakes in Vilas County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2004. 2 stations on file (most recent sample 2025).

DNR Assessment
Reported
Trophic State Index 35 (oligotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Common)Walleye(Common)Musky(Present)Largemouth Bass(Present)Smallmouth Bass(Present)Northern Pike(Present)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2024-06-24

Monitoring stations: 1