Skip to main content
LakeQuality
B

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.

Reviewed by LakeQuality Editorial Team · Updated

Track Inguadona Lake

Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.

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.

MetricValueGrade
Water Clarity (Secchi Depth)12.5 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)41Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth79 ft
Average Depth20.3 ft
Surface Area1.1K acres
Shoreline Length11 mi
Littoral Zone50%
Public AccessYes

Fish Species

black bullhead,black crappie,bluegill,bowfin (dogfish),brown bullhead,greater redhorse,green sunfish,hybrid sunfish,largemouth bass,muskellunge,northern pike,pumpkinseed,rock bass,shorthead redhorse,smallmouth bass,tullibee (cisco),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 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.

zebra mussel

Water Quality Trend: Declining

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.153 m/yr6
Phosphorus Stable+0.1 µg/L/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (19 observations).

Typical Ice-Out
Apr 22
Typical Ice-In
Dec 2

Estimated open water season: 224 days

EarliestLatest
Ice-Out2021-04-06 (2021)2022-05-06 (2022)
Ice-In2018-11-20 (2018)2015-12-20 (2015)

Most recent ice-out: 2025-04-20

Location

Loading map…

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

State Parks Near Inguadona Lake

DNR Fisheries Survey Summary

16 surveys on file from MN DNR Fisheries. Most recent: 2025-07-31 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Bluntnose Minnow13.37
BCS12.57
PGS11.48
LGP9.38
Yellow Perch7.040.14 lb
Bluegill6.380.21 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

91 fish · 47 in · 2024-08-05
623104567

Bluegill

141 fish · 210 in · 2024-08-05
30150trophy 102345678910

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,…

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 Inguadona Lake. 4 reports on file.

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

Mercury

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