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LakeQuality
A

Unnamed Bog Lake

Vilas County, WisconsinLimited DataOligotrophic

On the LakeGrade rubric, Unnamed Bog Lake pulls an A: clarity at 37.7 ft and phosphorus readings still being added put it in the top bracket for Wisconsin. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. Unnamed Bog Lake is small — 8 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Within Vilas County's 202 graded lakes, Unnamed Bog Lake ranks 127 — below the local median, though not at the bottom.

Unnamed Bog Lake has no invasive species recorded in Wisconsin state databases as of 2024, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Unnamed Bog Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. 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 2024-08-02. 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 37.7 ft down. Trophic State Index: 25.

MetricValueGrade
Water Clarity (Secchi Depth)37.7 ftA
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)25Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Surface Area8 acres

Water Quality Trend: Stable

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Stable0 m/yr2
See year-by-year chart →

Location

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County Ranking

Ranked #127 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 2007. 1 station on file (most recent sample 2025).

DNR Assessment
Reported
Trophic State Index 42 (mesotrophic) · 5-year average

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: 2024-08-02

Monitoring stations: 1