Inguadona Lake
Cass County, MinnesotaLimited DataMesotrophic
Inguadona Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth.
The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. At 79 ft of maximum depth, Inguadona Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. Inguadona Lake covers 1,133 acres alongside 11.0 miles of shoreline, large enough that conditions can vary meaningfully between bays. Within Cass County's 132 graded lakes, Inguadona Lake ranks 99 — below the local median, though not at the bottom.
Zebra mussel presence at Inguadona Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. Muskie are on the species list at Inguadona Lake, among the lake's 20 documented fish. A documented public access point at Inguadona Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 12 times at Inguadona Lake, with a median around Apr 22. 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 2022-07-13. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 12.5 ft. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.5 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 79 ft |
| Average Depth | 20.3 ft |
| Surface Area | 1.1K acres |
| Shoreline Length | 11 mi |
| Littoral Zone | 50% |
| Public Access | Yes |
Fish Species
Click a species to see all Minnesota and Wisconsin lakes where it is found.
→ Best fishing times for Inguadona Lake (14-day solunar calendar)
→ Is it safe to eat fish from Inguadona Lake? (mercury & PFAS guide)
→ Inguadona Lake fishing regulations (limits, seasons, special rules)
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.153 m/yr | 6 |
| Phosphorus | → Stable | +0.1 µg/L/yr | 5 |
Ice Season
Historical ice data from Minnesota DNR (19 observations).
Estimated open water season: 224 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2021-04-06 (2021) | 2022-05-06 (2022) |
| Ice-In | 2018-11-20 (2018) | 2015-12-20 (2015) |
Most recent ice-out: 2025-04-20
Location
County Ranking
Ranked #99 of 132 lakes in Cass County
Cleaner Lakes Within 30 Miles
Inguadona Lake holds Grade B. 5 nearby lakes hold higher grades.
Nearby Lakes in Cass County
More Minnesota Lake Rankings
State Parks Near Inguadona Lake
Other Grade B Lakes in Minnesota
Mesotrophic Lakes in Minnesota
Compare Inguadona Lake With Nearby Lakes
DNR Fisheries Survey Summary
16 surveys on file from MN DNR Fisheries. Most recent: 2025-07-31 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Bluntnose Minnow | 13.37 | — |
| BCS | 12.57 | — |
| PGS | 11.48 | — |
| LGP | 9.38 | — |
| Yellow Perch | 7.04 | 0.14 lb |
| Bluegill | 6.38 | 0.21 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.
Yellow Perch
Bluegill
From the 2025-07-31 survey
Temperature and dissolved oxygen measurements were collected from the deepest basin in Inguadona Lake, which is located partially within the Leech Lake Reservation, on July 31st, 2025, to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Cisco, also known as Tullibee,…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Inguadona Lake. 4 reports on file.
- —Fisheries Lake Survey — InguadonaFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Inguadona (1612)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — InguadonaFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — InguadonaPublic Water Access Sites · MN DNR LakeFinder
EPA Impairment Status
Inguadona 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 MN11-0120-02 · Official waterbody report · Matched by proximity (1.1 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: 2022-07-13
Monitoring stations: 1