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Little Webb Lake

Cass County, MinnesotaLimited DataOligotrophic

Little Webb Lake earns an A — every scored parameter (clarity) rates among the best monitored waters in Cass County.

A TSI value of 37 puts Little Webb Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. Little Webb Lake reaches 37 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake's 226 acres and 3.2 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Among the 132 graded lakes in Cass County, Little Webb Lake ranks 30 — in the top quartile locally.

No invasive species are currently listed at Little Webb Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Little Webb Lake, one of 13 fish species on record for the lake. A documented public access point at Little Webb Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 5 times at Little Webb Lake, with a median around Apr 21. 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 2024-10-20. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 16.5 ft down. Trophic State Index: 37.

MetricValueGrade
Water Clarity (Secchi Depth)16.5 ftA
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)37Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth37 ft
Surface Area226.04 acres
Shoreline Length3.2 mi
Littoral Zone30%
Public AccessYes

Fish Species

black bullhead,black crappie,bluegill,brown bullhead,hybrid sunfish,largemouth bass,northern pike,pumpkinseed,rock bass,walleye,white sucker,yellow bullhead,yellow perch

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

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

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

Little Webb Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Improving

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.305 m/yr3

Ice Season

Historical ice data from Minnesota DNR (8 observations).

Typical Ice-Out
Apr 21
Typical Ice-In
Dec 1

Estimated open water season: 224 days

EarliestLatest
Ice-Out2017-04-07 (2017)2008-05-05 (2008)
Ice-In2017-11-10 (2017)2007-12-01 (2007)

Most recent ice-out: 2017-04-07

Location

Loading map…

County Ranking

Ranked #30 of 132 lakes in Cass County

Nearby Lakes in Cass County

DNR Fisheries Survey Summary

13 surveys on file from MN DNR Fisheries. Most recent: 2023-08-21 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Bluegill29.810.18 lb
CNM15.27
BCS14.08
Bluntnose Minnow11.41
Northern Pike6.411.73 lb
Yellow Bass4.890.49 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.

Bluegill

107 fish · 38 in · 2023-08-21
32160345678

Northern Pike

4 fish · 1722 in · 2023-08-21
210171819202122

Yellow Bass

10 fish · 811 in · 2023-08-21
420891011

From the 2023-08-21 survey

A targeted survey of nearshore fish species in Little Webb Lake was conducted on August 21-22, 2023, by Index of Biological Integrity (IBI) Program staff. Sampling sites were evenly spaced around the lake, and each was sampled by backpack electrofishing and seining with a 50-foot or 15-foot seine, where possible.…

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 Little Webb Lake. 4 reports on file.

EPA Impairment Status

Little Webb Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN11-0311-00 · Official waterbody report · Matched by proximity (2.46 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2024-10-20

Monitoring stations: 1