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.
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16.5 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 37 ft |
| Surface Area | 226.04 acres |
| Shoreline Length | 3.2 mi |
| Littoral Zone | 30% |
| Public Access | Yes |
Fish Species
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).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.305 m/yr | 3 |
Ice Season
Historical ice data from Minnesota DNR (8 observations).
Estimated open water season: 224 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2017-04-07 (2017) | 2008-05-05 (2008) |
| Ice-In | 2017-11-10 (2017) | 2007-12-01 (2007) |
Most recent ice-out: 2017-04-07
Location
County Ranking
Ranked #30 of 132 lakes in Cass County
Nearby Lakes in Cass County
More Minnesota Lake Rankings
Other Grade A Lakes in Minnesota
Oligotrophic Lakes in Minnesota
DNR Fisheries Survey Summary
13 surveys on file from MN DNR Fisheries. Most recent: 2023-08-21 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Bluegill | 29.81 | 0.18 lb |
| CNM | 15.27 | — |
| BCS | 14.08 | — |
| Bluntnose Minnow | 11.41 | — |
| Northern Pike | 6.41 | 1.73 lb |
| Yellow Bass | 4.89 | 0.49 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
Northern Pike
Yellow Bass
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.…
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.
- —Fisheries Lake Survey — Little WebbFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Little Webb (1483)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — Little WebbFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — Little WebbPublic Water Access Sites · MN DNR LakeFinder
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
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