Jasper Lake
Cook County, Minnesota246 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Jasper Lake. Here is what has been measured.
- Impaired · Mercury
- 125 ft max depth
- Limited data
Jasper Lake in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 12 ft visibility. Maximum depth: 125 ft. Surface area: 245.78 acres.
Minnesota DNR's Standard Survey on July 27, 1992 caught 0.33 walleye per gill net at Jasper Lake. DNR survey details →
Jasper Lake is a 246-acre lake in Cook County, Minnesota with a maximum depth of 125 feet (31-foot average). 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 2025-07-20. Methodology: how these readings are compared.
What Jasper Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12 ft of visibility
- Deep water125 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Jasper Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Jasper 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 Jasper Lake
These are the measurements Minnesota PCA publishes for Jasper 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 Jasper Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on July 27, 1992 caught 0.33 walleye per gill net at Jasper Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Jasper Lake’s water-quality measurements separately, and the water-quality trend over 3 years of monitoring is stable. 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: 2024-08-06 (Targeted Survey).
3 surveys on file · most recent 2024-08-06 (Targeted Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Lake Trout | 1.04 | 2.59 lb | |
| Walleye | 0.67 | 0.88 lb | |
| White Sucker | 0.34 | 2.65 lb | |
| Smallmouth Bass | 0.29 | 1.64 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.
From the 2024-08-06 survey
Temperature and dissolved oxygen measurements were collected in the deepest basin in Jasper 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 also…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Jasper Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — JasperFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
125 ft
Average depth
31 ft
Surface area
246 acres
Shoreline
6.6 mi
Littoral zone
35%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
113 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,467 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Jasper Lake
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Fishing Jasper Lake
Water quality readings over time
3 seasons of samples on record (2020–2025). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Stable3 years
EPA Impairment Status
Jasper Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN16-0768-00 · Official waterbody report
Nearby Lakes in Cook County
Frequently asked questions about Jasper Lake
Where is Jasper Lake?
- Jasper 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 Jasper Lake?
- Jasper Lake in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 12 ft visibility. Maximum depth: 125 ft. Surface area: 245.78 acres.
Is Jasper Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Jasper Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Jasper Lake?
- Jasper Lake has a maximum depth of 125 feet and an average depth of 31 feet. The lake covers 245.78 acres.
What did the DNR fisheries survey find at Jasper Lake?
- Minnesota DNR's Standard Survey on July 27, 1992 caught 0.33 walleye per gill net at Jasper Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Jasper Lake’s water-quality measurements separately, and the water-quality trend over 3 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Jasper Lake?
- Public access to Jasper 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 Jasper 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
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Where this data comes from
3 measurements from 3 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
MNPCA3 samples · 2021–2025
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder