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Lake Wilipyro

Bayfield County, WisconsinMesotrophic

On the LakeGrade rubric, Lake Wilipyro pulls an A: clarity at 10.5 ft and 14 µg/L of phosphorus put it in the top bracket for Wisconsin. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

A TSI near 43 places Lake Wilipyro in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 25 ft puts Lake Wilipyro in the middle of Wisconsin's depth distribution. Lake Wilipyro is small — 72 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Lake Wilipyro ranks 23 of 52 in Bayfield County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Lake Wilipyro — the lake remains off the Wisconsin infested-waters roster. Bass fishing is part of the appeal: the species list runs to 3, anchored by largemouth and/or smallmouth bass. 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 2025-08-13. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Good clarity, visible to about 10.5 ft. Phosphorus level: 13.9 µg/L. Trophic State Index: 43.

MetricValueGrade
Water Clarity (Secchi Depth)10.5 ftB
Phosphorus13.9 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)43Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth25 ft
Surface Area72 acres

Fish Species

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

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

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

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

Water Quality Trend: Stable

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Stable-0.128 m/yr6
Phosphorus Stable-0.17 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #23 of 52 lakes in Bayfield County

Nearby Lakes in Bayfield County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2001. 2 stations on file (most recent sample 2025).

DNR Assessment
Good · Deep Seepage lake
Trophic State Index 44 (mesotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Present)Largemouth Bass(Present)Northern Pike(Present)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-08-13

Monitoring stations: 1