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Lake Content

Vilas County, WisconsinMesotrophic

Lake Content sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

A TSI near 41 places Lake Content in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Lake Content is a shallow lake at 14 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. At 239 acres, Lake Content fits the Wisconsin median for monitored lakes, with partial shoreline records. Within the 202 graded lakes of Vilas County, Lake Content sits at rank 165, near the bottom of the county list.

An invasive species record — Banded Mystery Snail — has been logged at Lake Content; Wisconsin DNR maintains the official infested-waters list. The fishery includes walleye alongside the lake's other 5 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 2025-09-02. 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 23.6 ft down. Phosphorus level: 23.8 µg/L. Trophic State Index: 41.

MetricValueGrade
Water Clarity (Secchi Depth)23.6 ftA
Phosphorus23.8 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)41Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth14 ft
Surface Area239 acres

Fish Species

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

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

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

Lake Content fishing regulations (limits, seasons, special rules)

Invasive Species

Banded Mystery SnailChinese Mystery Snail

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.25 m/yr6
Phosphorus Improving-7.5 µg/L/yr2
See year-by-year chart →

Location

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County Ranking

Ranked #165 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 1995. 1 station on file (most recent sample 2025).

Fish Species (DNR-rated)

Panfish(Abundant)Northern Pike(Abundant)Walleye(Common)Musky(Present)Largemouth Bass(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: 2025-09-02

Monitoring stations: 1