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.
Track Lake Sharon
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9 ft | C |
| Phosphorus | 11.5 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 30 ft |
| Surface Area | 47 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.
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.814 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.26 µg/L/yr | 6 |
Location
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.
- ACrystal LakeMarquette County · mi · Higher grade (B → A)
- ATuttle LakeMarquette County · mi · Higher grade (B → A)
- AWood LakeMarquette County · mi · Higher grade (B → A)
- APleasant LakeWaushara County · mi · Higher grade (B → A)
Nearby Lakes in Marquette County
More Wisconsin Lake Rankings
State Parks Near Lake Sharon
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
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)
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