Million Lake
Million Lake in Cass County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5 ft visibility. Phosphorus: 21 µg/L. Chlorophyll-a (algae): 3.8 µg/L. Maximum depth: 20 ft. Surface area: 21.98 acres.
- Clarity
- 5 ft
- Max depth
- 20 ft
- Area
- 22 acres
- Trend
- ↑ Improving
- Public access
- No
Next lake in Cass County
Why Million Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Million Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by MPCA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Million Lake is a 22-acre lake in Cass County, Minnesota with a maximum depth of 20 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2022-06-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Million Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 5 ft. Phosphorus level: 21 µg/L. Chlorophyll-a: 3.8 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | 21 µg/L | Not graded |
| Chlorophyll-a (Algae) | 3.8 µg/L | Not graded |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Million Lake
Compare lakeside cabins, hotels, and vacation rentals near Million Lake in Cass County, Minnesota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 20 ft |
| Surface Area | 22 acres |
| Shoreline Length | 1.2 mi |
| Public Access | No |
Fishing Million Lake
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1989-06-15 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Yellow Perch | 16.25 | 0.15 lb |
| Largemouth Bass | 1.75 | 0.97 lb |
| Walleye | 0.50 | 1.5 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
From the 1989-06-15 survey
Three species of fish were captured during the lake survey - largemouth bass, yellow perch, and walleye. Though not captured during the survey, an angler reported catching a bluegill in 1989. The sample of largemouth bass exhibit a good length frequency, and age and growth analysis indicates that they exhibit a good…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Million Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — MillionFisheries Lake Survey · MN DNR LakeFinder
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +3.37 m/yr | 2 |
| Phosphorus | ↑ Improving | -12 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -2.5 µg/L/yr | 2 |
Graded lakes near Million Lake
Million Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Cass County
Frequently asked questions about Million Lake
What is the water quality grade for Million Lake?
- Million Lake in Cass County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5 ft visibility. Phosphorus: 21 µg/L. Chlorophyll-a (algae): 3.8 µg/L. Maximum depth: 20 ft. Surface area: 21.98 acres.
Is Million Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Million Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 3.8 µg/L. Always check local health department advisories before swimming.
How deep is Million Lake?
- Million Lake has a maximum depth of 20 feet. The lake covers 21.98 acres.
Explore Million Lake across LakeGrade
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Where this data comes from
5 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA5 samples · 2022
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 2130 B ~ Nephelometric Method
- 2120 B ~ Color in Water by Visual Comparison
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake details from Minnesota DNR LakeFinder