Polly Lake
Lake County, Minnesota122 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Polly Lake. Here is what has been measured.
- 95 ft max depth
- Limited data
Polly Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 11 ft visibility. Maximum depth: 95 ft. Surface area: 121.53 acres.
Minnesota DNR's Standard Survey on September 8, 1985 caught 1.75 northern pike per gill net at Polly Lake. DNR survey details →
Polly Lake is a 122-acre lake in Lake County, Minnesota with a maximum depth of 95 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2020-07-19. Methodology: how these readings are compared.
What Polly Lake is good for
From access and monitoring records, not editorial picks.
- Clear water11 ft of visibility
- Deep water95 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Polly Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Polly Lake
These are the measurements Minnesota PCA publishes for Polly Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 11 ft. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 11ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Polly Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on September 8, 1985 caught 1.75 northern pike per gill net at Polly Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Polly Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
2 surveys on file from MN DNR Fisheries. Most recent: 1985-09-08 (Standard Survey).
2 surveys on file · most recent 1985-09-08 (Standard Survey)
41 years old| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| White Sucker | 2.54 | 0.54 lb | |
| Northern Pike | 1.38 | 7.5 lb | |
| Yellow Perch | 0.12 | 0.1 lb | |
| Largemouth Bass | 0.12 | 0.1 lb |
CPUE = catch per unit effort, fish caught per net per set in a standardised survey. It measures abundance, not size, and is not a weekly bite report.
From the 1985-09-08 survey
Fish populations are dominated by large numbers of small whitefish and smaller, but substantial numbers of big northern pike and small white suckers. Yellow perch and largemouth bass also present.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Polly Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — EddyFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
95 ft
Surface area
122 acres
Shoreline
4.5 mi
Littoral zone
37%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
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Stays near Polly Lake
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Follow Polly Lake’s readings
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Fishing Polly Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2025).
Water clarity
Worsening5 years
Nearby Lakes in Lake County
Frequently asked questions about Polly Lake
Where is Polly Lake?
- Polly Lake is a lake in Lake County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Polly Lake?
- Polly Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 11 ft visibility. Maximum depth: 95 ft. Surface area: 121.53 acres.
Is Polly Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Polly Lake?
- Polly Lake has a maximum depth of 95 feet. The lake covers 121.53 acres.
What did the DNR fisheries survey find at Polly Lake?
- Minnesota DNR's Standard Survey on September 8, 1985 caught 1.75 northern pike per gill net at Polly Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Polly Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Polly Lake?
- Public access to Polly Lake is listed as no on the lake record, so confirm before you make the trip. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
Explore Polly Lake across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA1 sample · 2020
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake details from Minnesota DNR LakeFinder