Strup Lake
Lake County, Minnesota1,689 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Strup Lake. Here is what has been measured.
- 195 ft max depth
- Limited data
Strup Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 10 ft visibility. Maximum depth: 195 ft. Surface area: 1688.66 acres.
Minnesota DNR's Standard Survey on September 18, 2017 caught 0.17 smallmouth bass per gill net at Strup Lake. DNR survey details →
Strup Lake is a 1,689-acre lake in Lake County, Minnesota with a maximum depth of 195 feet. Overall water quality is declining over recent sampling years. The lake supports 5 documented fish species including lake trout, rock bass, and smallmouth bass. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-07-11. Methodology: how these readings are compared.
What Strup Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10 ft of visibility
- Fishing5 species recorded
- Deep water195 ft surveyed max depth
- Big water1,689 acres
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Strup 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 Strup Lake
These are the measurements Minnesota PCA publishes for Strup 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 10 ft. TSI 44.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10ft | 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. | 44 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Strup Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on September 18, 2017 caught 0.17 smallmouth bass per gill net at Strup Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Strup 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
3 surveys on file from MN DNR Fisheries. Most recent: 2017-09-18 (Standard Survey).
3 surveys on file · most recent 2017-09-18 (Standard Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Rock Bass | 12.50 | 4–8 in 2017-09-18 | 0.13 lb |
| Lake Trout | 5.03 | 10–19 in 2017-09-18 | 1.73 lb |
| Yellow Perch | 2.83 | 5–7 in 2017-09-18 | 0.11 lb |
| White Sucker | 1.77 | 14–22 in 2017-09-18 | 2.65 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.
Rock Bass
Lake Trout
Yellow Perch
White Sucker
From the 2017-09-18 survey
Kekekabic Lake is located approximately 31 miles NE of Ely in the BWCAW. This scenic lake has high cliffs and steep shorelines with good water clarity. There are several access options for visitors. All of these options include portages to access Kekekabic Lake and most visitors should allow more than one day to…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Strup Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — KekekabicFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
195 ft
Surface area
1,689 acres
Shoreline
22.9 mi
Littoral zone
6%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
3 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,585 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Strup Lake
Compare lakeside cabins, hotels, and vacation rentals near Strup 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 Strup Lake
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Follow Strup Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Strup 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 Strup Lake
Where is Strup Lake?
- Strup 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 Strup Lake?
- Strup Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 10 ft visibility. Maximum depth: 195 ft. Surface area: 1688.66 acres.
Is Strup Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Strup Lake?
- Strup Lake has a maximum depth of 195 feet. The lake covers 1688.66 acres.
What fish are in Strup Lake?
- Fish species found in Strup Lake include lake trout, rock bass, smallmouth bass, white sucker, yellow perch. Strup Lake is located in Lake County, Minnesota.
What did the DNR fisheries survey find at Strup Lake?
- Minnesota DNR's Standard Survey on September 18, 2017 caught 0.17 smallmouth bass per gill net at Strup Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Strup 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 Strup Lake?
- Public access to Strup 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 Strup 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 Lake County
Species activity outlook by water temperature and season
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Where this data comes from
13 measurements from 7 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
MNPCA13 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (7)
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