Lobster Lake
Douglas County, MinnesotaMesotrophic
Lobster Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.
The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. Lobster Lake is unusually deep for Minnesota at 65 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. Lobster Lake covers 1,334 acres alongside 17.3 miles of shoreline, large enough that conditions can vary meaningfully between bays. Lobster Lake ranks 24 of 51 in Douglas County — solidly in the upper half of the local distribution.
Zebra mussel presence at Lobster Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. Lobster Lake's fishery is anchored by muskellunge, with 18 documented species in total — a destination water for muskie anglers. A documented public access point at Lobster Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 12 observed ice-outs, centered near 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 2024-09-29. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 13 ft. Phosphorus level: 20 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13 ft | B |
| Phosphorus | 20 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 65 ft |
| Average Depth | 15 ft |
| Surface Area | 1.3K acres |
| Shoreline Length | 17.3 mi |
| Littoral Zone | 52% |
| Public Access | Yes |
Fish Species
Click a species to see all Minnesota and Wisconsin lakes where it is found.
→ Best fishing times for Lobster Lake (14-day solunar calendar)
→ Is it safe to eat fish from Lobster Lake? (mercury & PFAS guide)
→ Lobster Lake fishing regulations (limits, seasons, special rules)
Invasive Species
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.013 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.9 µg/L/yr | 5 |
Ice Season
Historical ice data from Minnesota DNR (18 observations).
Estimated open water season: 226 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2016-03-24 (2016) | 2018-05-03 (2018) |
| Ice-In | 2018-11-13 (2018) | 2015-12-18 (2015) |
Most recent ice-out: 2023-04-29
Location
County Ranking
Ranked #24 of 51 lakes in Douglas County
Nearby Lakes in Douglas County
More Minnesota Lake Rankings
State Parks Near Lobster Lake
Other Grade B Lakes in Minnesota
Mesotrophic Lakes in Minnesota
DNR Fisheries Survey Summary
16 surveys on file from MN DNR Fisheries. Most recent: 2023-05-02 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| BKS | 78.14 | — |
| Bluntnose Minnow | 28.41 | — |
| Bluegill | 25.26 | 0.14 lb |
| Largemouth Bass | 16.78 | 0.58 lb |
| BKF | 11.92 | — |
| IOD | 4.92 | — |
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
Largemouth Bass
From the 2023-05-02 survey
A mark-recapture population estimate of Muskies began in spring of 2022 on Lobster Lake using passive integrated transponder (PIT) tags (see 2022 targeted survey). Fish were sampled using both large frame trap nets and electrofishing in 2022. In spring of 2023, fish were recaptured using exclusively electrofishing. A…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Lobster Lake. 4 reports on file.
- —Fisheries Lake Survey — LobsterFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Lobster (1078)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — LobsterFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — LobsterPublic Water Access Sites · MN DNR LakeFinder
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: 2024-09-29
Monitoring stations: 5