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LakeQuality
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Schultz Lake

St. Louis County, MinnesotaLimited DataOligotrophic

Schultz Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in St. Louis County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

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 bottoms out at 48 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 210 acres, Schultz Lake fits the Minnesota median for monitored lakes, with 2.9 miles of shoreline. Within St. Louis County's 187 graded waters, Schultz Lake sits at rank 7, near the top of the local distribution.

No invasive species are currently listed at Schultz Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Schultz Lake, one of 11 fish species on record for the lake. No formal public access is documented at Schultz Lake — most use is by shoreline residents and their guests. Ice-out has been recorded 16 times at Schultz Lake, with a median around Apr 24. 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, Minnesota DNR LakeFinder, last sampled 2024-09-22. 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 15.5 ft down. Trophic State Index: 38.

MetricValueGrade
Water Clarity (Secchi Depth)15.5 ftA
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)38Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth48 ft
Average Depth20 ft
Surface Area210.34 acres
Shoreline Length2.9 mi
Littoral Zone41%
Public AccessNo

Fish Species

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

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

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

Schultz Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Improving

Based on 5 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.292 m/yr5

Ice Season

Historical ice data from Minnesota DNR (26 observations).

Typical Ice-Out
Apr 24
Typical Ice-In
Nov 27

Estimated open water season: 217 days

EarliestLatest
Ice-Out2024-04-08 (2024)2014-05-10 (2014)
Ice-In2003-11-07 (2003)2016-12-09 (2016)

Most recent ice-out: 2024-04-08

Location

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County Ranking

Ranked #7 of 187 lakes in St. Louis County

Nearby Lakes in St. Louis County

DNR Fisheries Survey Summary

2 surveys on file from MN DNR Fisheries. Most recent: 2012-09-04 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Largemouth Bass29.380.81 lb
Bluntnose Minnow11.78
Pumpkinseed8.510.13 lb
MTS6.38
Yellow Perch6.100.19 lb
Bluegill4.980.12 lb

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

Length Distributions

Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.

Largemouth Bass

77 fish · 517 in · 2012-09-04
23120567891011121314151617

Pumpkinseed

85 fish · 38 in · 2012-09-04
25130345678

Yellow Perch

38 fish · 511 in · 2012-09-04
950trophy 12567891011

Bluegill

139 fish · 38 in · 2012-09-04
47240345678

From the 2012-09-04 survey

Schultz is a 215 acre lake with 87 acres (40%) of littoral area and a maximum depth of 48 feet. The lake is located approximately 10 miles north of Duluth, MN. There is no public access to Schultz Lake. Schultz was last surveyed in 1992. Schultz was assessed during the summer of 2012 to update information about fish…

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 Schultz Lake. 3 reports 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: 2024-09-22

Monitoring stations: 2