Maple Lake
Maple Lake in Cass County, Minnesota has a water quality grade of A (Excellent). Water clarity: 13.3 ft visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 2.2 µg/L. Maximum depth: 45 ft. Surface area: 76.36 acres.
- Clarity
- 13.3 ft
- Typical in August
- 64°F
- Max depth
- 45 ft
- Area
- 76 acres
- Type
- Oligotrophic
- Trend
- → Stable
- Public access
- No
Next lake in Cass County
Maple Lake is a 76-acre cold, clear oligotrophic lake in Cass County, Minnesota with a maximum depth of 45 feet. Water quality is graded A based on 3 sampling years through 2025. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 103 other monitored lakes in Cass County, Maple Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-08-15. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Good clarity, visible to about 13.3 ft. Phosphorus level: 11 µg/L. Chlorophyll-a: 2.2 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.3 ft | Not graded |
| Phosphorus | 11 µg/L | Good |
| Chlorophyll-a (Algae) | 2.2 µg/L | Good |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Maple Lake
Compare lakeside cabins, hotels, and vacation rentals near Maple 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.
Top-rated places to stay near Maple Lake
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Water Temperature
Maple Lake typically sits around 64°F at the surface in August. Summer average is about 62°F. Usually warmest in Jul (about 64°F) and coldest in May (about 53°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 448 field readings (2011–2025) via the EPA Water Quality Portal. See the full Maple Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 45 ft |
| Surface Area | 76 acres |
| Shoreline Length | 2.1 mi |
| Public Access | No |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fishing Maple Lake
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1990-06-06 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Green Sunfish | 16.88 | 0.41 lb |
| Northern Pike | 9.56 | 1.97 lb |
| Black Crappie | 8.56 | 0.32 lb |
| Bluegill | 4.38 | 0.15 lb |
| Largemouth Bass | 2.00 | 0.82 lb |
| Hybrid Sunfish | 1.12 | 0.38 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
From the 1990-06-06 survey
The northern pike gillnet catch of 17.3 is very high when compared to other area lakes. Most of the fish sampled were less than 20 inches long, but fish over 30 inches were collected. The growth rate for northern pike is not fast.There is an abundant green sunfish population in Maple Lake. They range in length from 5…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Maple Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — MapleFisheries Lake Survey · MN DNR LakeFinder
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.07 m/yr | 6 |
County Ranking
Ranked #8 of 104 lakes in Cass County
Nearby Lakes in Cass County
Frequently asked questions about Maple Lake
What is the water quality grade for Maple Lake?
- Maple Lake in Cass County, Minnesota has a water quality grade of A (Excellent). Water clarity: 13.3 ft visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 2.2 µg/L. Maximum depth: 45 ft. Surface area: 76.36 acres.
Is Maple Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Maple Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 2.2 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Maple Lake?
- Maple Lake typically sits around 64°F at the surface in August, from 448 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
How deep is Maple Lake?
- Maple Lake has a maximum depth of 45 feet. The lake covers 76.36 acres.
Explore Maple Lake across LakeGrade
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Where this data comes from
83 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Leech Lake Band of Ojibwe
LEECHLAK_WQX47 samples · 2022 - Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA36 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Nitrate-Nitrite Nitrogen by Colorimetry
Monitoring station identifiers (3)
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 size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder