Lake Pesobic
Lincoln County, WisconsinMesotrophic
Lake Pesobic carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.
The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. Lake Pesobic is a shallow lake at 11 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. At 147 acres, Lake Pesobic fits the Wisconsin median for monitored lakes, with partial shoreline records. Lake Pesobic sits at rank 12 of 18 in Lincoln County, in the lower half of the local distribution.
An invasive species record — Chinese Mystery Snail — has been logged at Lake Pesobic; Wisconsin DNR maintains the official infested-waters list. The fishery includes walleye among the lake's 4 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 2025-08-20. Grade methodology: LakeGrade methodology.
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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 7 ft. Phosphorus level: 22.2 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | C |
| Phosphorus | 22.2 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 11 ft |
| Surface Area | 147 acres |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Lake Pesobic (14-day solunar calendar)
→ Is it safe to eat fish from Lake Pesobic? (mercury & PFAS guide)
→ Lake Pesobic 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 | → Stable | +0.129 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.97 µg/L/yr | 6 |
Location
County Ranking
Ranked #12 of 18 lakes in Lincoln County
Cleaner Lakes Within 30 Miles
Lake Pesobic holds Grade B. 3 nearby lakes hold higher grades.
- ABass LakeLincoln County · mi · Higher grade (B → A)
- ALong LakeLincoln County · mi · Higher grade (B → A)
- ASeven Island LakeLincoln County · mi · Higher grade (B → A)
Nearby Lakes in Lincoln County
More Wisconsin Lake Rankings
State Parks Near Lake Pesobic
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 1986. 1 station on file (most recent sample 2026).
Fish Species (DNR-rated)
EPA Impairment Status
Lake Pesobic is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10008934 · Official waterbody report
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-08-20
Monitoring stations: 1