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LakeQuality
F

Pike Lake

Scott County, MinnesotaHypereutrophic

Pike Lake grades an F: water clarity, phosphorus, and chlorophyll-a all rate poorly, placing it among the most stressed lakes monitored in Minnesota. 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.

Hypereutrophic conditions mean the lake is operating at the upper end of the productivity scale, with all the bloom risk that implies. Pike Lake is a shallow lake at 9 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. At 49 acres, Pike Lake sits below the Minnesota median: a small water where shoreline activity has an outsized effect on water quality. Within Scott County's 17 graded lakes, Pike Lake ranks 12 — below the local median, though not at the bottom.

Pike Lake is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. The state fisheries records do not list documented species for Pike Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. 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, Minnesota DNR LakeFinder, last sampled 2023-10-10. Grade methodology: LakeGrade methodology.

Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 2 ft of visibility. Phosphorus level: 181.5 µg/L. Trophic State Index: 73.

MetricValueGrade
Water Clarity (Secchi Depth)2 ftF
Phosphorus181.5 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)73Hypereutrophic

Very high nutrients, dense algae, poor clarity

Lake Details

CharacteristicValue
Maximum Depth9 ft
Surface Area48.97 acres
Shoreline Length2.3 mi
Littoral Zone100%
Public AccessNo

Invasive Species

Eurasian watermilfoilzebra mussel

Water Quality Trend: Declining

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.082 m/yr4
Phosphorus Declining+168.15 µg/L/yr3

Ice Season

Historical ice data from Minnesota DNR (15 observations).

Typical Ice-Out
Mar 19
Typical Ice-In
Dec 2

Estimated open water season: 258 days

EarliestLatest
Ice-Out2017-03-07 (2017)2009-03-25 (2009)
Ice-In2013-11-26 (2013)2009-12-04 (2009)

Most recent ice-out: 2017-03-07

Location

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County Ranking

Ranked #12 of 17 lakes in Scott County

Nearby Lakes in Scott County

Hypereutrophic Lakes in Minnesota

DNR Fisheries Survey Summary

1 survey on file from MN DNR Fisheries. Most recent: 1978-07-20 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Black Bullhead0.670.6 lb
Yellow Perch0.330.1 lb

CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.

From the 1978-07-20 survey

Test nettting in Pike Lake caught 2 BLB and 1 YP in 3 trap nets and numerous salamanders in the gillnet set.

Source: MN DNR LakeFinder Fisheries Lake Survey

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Pike Lake. 1 report on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2023-10-10

Monitoring stations: 2