Alpine Lake
Cook County, Minnesota909 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Alpine Lake. Here is what has been measured.
- 65 ft max depth
- Limited data
Alpine Lake in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 12 ft visibility. Maximum depth: 65 ft. Surface area: 908.63 acres.
Minnesota DNR's Standard Survey on September 3, 2002 caught 4.25 walleye per gill net at Alpine Lake. Length samples in the latest survey that recorded them ran 7–27 inches. DNR survey details →
Alpine Lake is a 909-acre lake in Cook County, Minnesota with a maximum depth of 65 feet. Overall water quality is declining 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 2025-07-08. Methodology: how these readings are compared.
What Alpine Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12 ft of visibility
- Deep water65 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Alpine Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Alpine Lake
These are the measurements Minnesota PCA publishes for Alpine Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 12 ft. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 12ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Alpine Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on September 3, 2002 caught 4.25 walleye per gill net at Alpine Lake. Length samples in the latest survey that recorded them ran 7–27 inches.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Alpine Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
4 surveys on file from MN DNR Fisheries. Most recent: 2024-08-06 (Targeted Survey).
4 surveys on file · most recent 2024-08-06 (Targeted Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Tullibee (Cisco) | 26.33 | 0.13 lb | |
| Walleye | 4.25 | 7–27 in 2002-09-03 | 1.95 lb |
| Northern Pike | 0.50 | 20–27 in 2002-09-03 | 3.51 lb |
| White Sucker | 0.43 | 15–22 in 2002-09-03 | 2.14 lb |
| Lake Trout | 0.17 | 5.9 lb |
CPUE = catch per unit effort, fish caught per net per set in a standardised survey. It measures abundance, not size, and is not a weekly bite report.
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.
Walleye
Northern Pike
White Sucker
From the 2024-08-06 survey
Temperature and dissolved oxygen measurements were collected in the deepest basin in Alpine Lake, on August 6, 2024, to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Trout, the most sensitive coldwater species present in this lake (Lake Whitefish and Cisco,…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Alpine Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — AlpineFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
65 ft
Surface area
909 acres
Shoreline
23.9 mi
Littoral zone
44%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
149 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,450 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Alpine Lake
Compare lakeside cabins, hotels, and vacation rentals near Alpine Lake in Cook 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 Alpine Lake
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Follow Alpine Lake’s readings
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Fishing Alpine Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2025).
Water clarity
Worsening5 years
Nearby Lakes in Cook County
Frequently asked questions about Alpine Lake
Where is Alpine Lake?
- Alpine Lake is a lake in Cook County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Alpine Lake?
- Alpine Lake in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 12 ft visibility. Maximum depth: 65 ft. Surface area: 908.63 acres.
Is Alpine Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Alpine Lake?
- Alpine Lake has a maximum depth of 65 feet. The lake covers 908.63 acres.
What did the DNR fisheries survey find at Alpine Lake?
- Minnesota DNR's Standard Survey on September 3, 2002 caught 4.25 walleye per gill net at Alpine Lake. Length samples in the latest survey that recorded them ran 7–27 inches. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Alpine Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Alpine Lake?
- Public access to Alpine Lake is listed as no on the lake record, so confirm before you make the trip. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
Explore Alpine Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
Fish species and the cleanest lakes across Minnesota
Fish species and best lakes in Cook County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its readings
Lakes in the Lake Superior Basin (MN+WI), ranked by water quality
Minnesota's cleanest lakes, ranked on agency measurements
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Mesotrophic Lakes in Minnesota
Where this data comes from
7 measurements from 6 monitoring stations, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA7 samples · 2021–2025
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (6)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder