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LakeQuality
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Church Pine Lake

Polk County, WisconsinOligotrophic

Church Pine Lake sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Trophically, Church Pine Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. A maximum depth of 45 ft puts Church Pine Lake in the middle of Wisconsin's depth distribution. At 87 acres, Church Pine Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Church Pine Lake ranks 11 of 77 in Polk County, putting it in the upper tier of locally monitored lakes.

Church Pine Lake has at least one documented invasive species (Chinese Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. Walleye are documented at Church Pine Lake, one of 4 fish species on record for the lake. A documented public access point at Church Pine Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. 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 2025-09-01. 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 42.7 ft down. Phosphorus level: 13.5 µg/L. Trophic State Index: 32.

MetricValueGrade
Water Clarity (Secchi Depth)42.7 ftA
Phosphorus13.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)32Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth45 ft
Surface Area87 acres
Public AccessYes

Fish Species

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

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

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

Church Pine Lake fishing regulations (limits, seasons, special rules)

Invasive Species

Chinese Mystery Snail

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Stable-0.036 m/yr7
Phosphorus Improving-0.44 µg/L/yr6
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #11 of 77 lakes in Polk County

Nearby Lakes in Polk County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1986. 1 station on file (most recent sample 2025).

DNR Assessment
Excellent · Deep Headwater lake
Trophic State Index 39 (oligotrophic) · 5-year average

Fish Species (DNR-rated)

Panfish(Common)Largemouth Bass(Common)Northern Pike(Present)Walleye(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: 2025-09-01

Monitoring stations: 1