Ahsub Lake
Lake County, Minnesota60 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Ahsub Lake. Here is what has been measured.
- 78 ft max depth
- Limited data
Ahsub Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 16.5 ft visibility. Maximum depth: 78 ft. Surface area: 60.33 acres.
Minnesota DNR's Standard Survey on September 16, 2024 caught 0.25 northern pike per gill net at Ahsub Lake. DNR survey details →
Ahsub Lake is a 60-acre lake in Lake County, Minnesota with a maximum depth of 78 feet. Overall water quality is declining over recent sampling years. The lake supports 6 documented fish species including bluegill, hybrid sunfish, and northern pike. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-08-30. Methodology: how these readings are compared.
What Ahsub Lake is good for
From access and monitoring records, not editorial picks.
- Clear water16.5 ft of visibility
- Fishing6 species recorded
- Deep water78 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 Ahsub 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 Ahsub Lake
These are the measurements Minnesota PCA publishes for Ahsub Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 16.5 ft down. TSI 37.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 16.5ft | 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. | 37 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Ahsub Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on September 16, 2024 caught 0.25 northern pike per gill net at Ahsub Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Ahsub 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
8 surveys on file from MN DNR Fisheries. Most recent: 2024-09-16 (Standard Survey).
8 surveys on file · most recent 2024-09-16 (Standard Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| White Sucker | 12.38 | 10–21 in 2024-09-16 | 1.54 lb |
| Bluegill | 7.75 | 3–5 in 2024-09-16 | 0.07 lb |
| Brook Trout | 5.42 | 6–18 in 2005-05-31 | 0.67 lb |
| Yellow Perch | 2.75 | 6–7 in 2024-09-16 | 0.13 lb |
| Hybrid Sunfish | 1.50 | 3–6 in 2024-09-16 | 0.08 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.
White Sucker
Bluegill
Brook Trout
Yellow Perch
From the 2024-09-16 survey
Ahsub is a 60-acre designated stream trout lake located 24 miles northeast of Ely in the Boundary Waters Canoe Area Wilderness. It is deep, clear, and rather unproductive. Two windstorms have torn down much of the forest surrounding the lake, but a few scattered mature trees punctuate the regenerating hardwoods and…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Ahsub Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — AhsubFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
78 ft
Surface area
60 acres
Shoreline
2.5 mi
Littoral zone
36%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,509 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Ahsub Lake
Compare lakeside cabins, hotels, and vacation rentals near Ahsub Lake in Lake 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 Ahsub Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Follow Ahsub Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fish Species
Click a species to see every lake where it is documented.
Fishing Ahsub Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2025).
Water clarity
Worsening5 years
Nearby Lakes in Lake County
Frequently asked questions about Ahsub Lake
Where is Ahsub Lake?
- Ahsub Lake is a lake in Lake County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Ahsub Lake?
- Ahsub Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 16.5 ft visibility. Maximum depth: 78 ft. Surface area: 60.33 acres.
Is Ahsub Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Ahsub Lake?
- Ahsub Lake has a maximum depth of 78 feet. The lake covers 60.33 acres.
What fish are in Ahsub Lake?
- Fish species found in Ahsub Lake include bluegill, hybrid sunfish, northern pike, smallmouth bass, white sucker, yellow perch. Ahsub Lake is located in Lake County, Minnesota.
What did the DNR fisheries survey find at Ahsub Lake?
- Minnesota DNR's Standard Survey on September 16, 2024 caught 0.25 northern pike per gill net at Ahsub Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Ahsub 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 Ahsub Lake?
- Public access to Ahsub 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 Ahsub Lake across LakeQuality
Fish species and the cleanest lakes across Minnesota
Fish species and best lakes in Lake 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
More lakes in Minnesota
Other Lakes in Minnesota
Oligotrophic Lakes in Minnesota
Where this data comes from
5 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA5 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (3)
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