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B

Lake Sharon

Marquette County, WisconsinMesotrophic

Lake Sharon comes in at a B on the grading rubric — a respectable showing for a Wisconsin lake of its size and depth. Secchi readings are the weakest of the scored parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

Mesotrophic conditions dominate at Lake Sharon: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 30 ft puts Lake Sharon in the middle of Wisconsin's depth distribution. At 47 acres, Lake Sharon sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Lake Sharon ranks 6 of 13 in Marquette County — solidly in the upper half of the local distribution.

Lake Sharon carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. The fishery is bass-led, with 3 documented species across the lake's records. 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 2025-08-17. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 9 ft. Phosphorus level: 11.5 µg/L. Trophic State Index: 42.

MetricValueGrade
Water Clarity (Secchi Depth)9 ftC
Phosphorus11.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)42Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth30 ft
Surface Area47 acres

Fish Species

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

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

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

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

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Eurasian Water-Milfoil

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.814 m/yr6
Phosphorus Improving-0.26 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #6 of 13 lakes in Marquette County

Cleaner Lakes Within 30 Miles

Lake Sharon holds Grade B. 4 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Marquette County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2003. 1 station on file (most recent sample 2025).

Fish Species (DNR-rated)

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

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-08-17

Monitoring stations: 1