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LakeQuality
A

Pickerel Lake [Site 4]

Oconto County, WisconsinLimited DataOligotrophic

Pickerel Lake [Site 4] earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Oconto County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. At 176 acres, Pickerel Lake [Site 4] fits the Wisconsin median for monitored lakes, with partial shoreline records. Within Oconto County's 66 graded lakes, Pickerel Lake [Site 4] ranks 42 — below the local median, though not at the bottom.

Pickerel Lake [Site 4] has at least one documented invasive species (Banded Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. The fishery is bass-led, with 3 documented species across the lake's records. A documented public access point at Pickerel Lake [Site 4] makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2020-10-24. 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 36.1 ft down. Trophic State Index: 25.

MetricValueGrade
Water Clarity (Secchi Depth)36.1 ftA
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)25Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Surface Area176 acres
Public AccessYes

Fish Species

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

→ Best fishing times for Pickerel Lake [Site 4] (14-day solunar calendar)

→ Is it safe to eat fish from Pickerel Lake [Site 4]? (mercury & PFAS guide)

Pickerel Lake [Site 4] fishing regulations (limits, seasons, special rules)

Invasive Species

Banded Mystery SnailChinese Mystery SnailPurple LoosestrifeRusty Crayfish

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Stable+0.086 m/yr7
Phosphorus Improving-0.57 µg/L/yr6
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #42 of 66 lakes in Oconto County

Nearby Lakes in Oconto County

State Parks Near Pickerel Lake [Site 4]

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2015. 5 stations on file (most recent sample 2025).

DNR Assessment
Excellent · Shallow Headwater lake
Trophic State Index 45 (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

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2020-10-24

Monitoring stations: 1