Quarter Line Lake
St. Louis County, Minnesota20 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Quarter Line Lake. Here is what has been measured.
- Impaired · Mercury
- 22 ft max depth
- Limited data
Quarter Line Lake in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 4.6 ft visibility. Maximum depth: 22 ft. Surface area: 19.56 acres.
Minnesota DNR's Standard Survey on June 25, 2007 caught 11.00 northern pike per gill net at Quarter Line Lake. Length samples in the latest survey that recorded them ran 15–20 inches. DNR survey details →
Quarter Line Lake is a 20-acre lake in St. Louis County, Minnesota with a maximum depth of 22 feet. Overall water quality is declining over recent sampling years. The lake supports 3 documented fish species including largemouth bass, northern pike, and yellow perch. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-08-21. Methodology: how these readings are compared.
What Quarter Line Lake is good for
From access and monitoring records, not editorial picks.
- Fishing3 species recorded
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Quarter Line Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Quarter Line 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 Quarter Line Lake
These are the measurements Minnesota PCA publishes for Quarter Line Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.6 ft. TSI 55.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.6ft | 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. | 55 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Quarter Line Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on June 25, 2007 caught 11.00 northern pike per gill net at Quarter Line Lake. Length samples in the latest survey that recorded them ran 15–20 inches.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Quarter Line 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
2 surveys on file from MN DNR Fisheries. Most recent: 2007-06-25 (Standard Survey).
2 surveys on file · most recent 2007-06-25 (Standard Survey)
19 years old| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Northern Pike | 5.46 | 15–20 in 2007-06-25 | 1.11 lb |
| Yellow Perch | 2.54 | 2–13 in 2007-06-25 | 0.33 lb |
| Largemouth Bass | 1.00 | 11 in 2007-06-25 | 0.98 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.
Northern Pike
Yellow Perch
Largemouth Bass
From the 2007-06-25 survey
Quarterline is a small (21 acre), bog stained lake located on the Kabetogama Peninsula within the interior of Voyaguers National Park. Quarterline Lake is only accessible via portage trails; the shortest commensing in Lost Bay of Kabetogama Lake. The lake has a maximum depth of 22.0 feet and, except for the bog in the…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Quarter Line Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — UnnamedFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
22 ft
Surface area
20 acres
Shoreline
0.9 mi
Littoral zone
92%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
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Stays near Quarter Line Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Quarter Line Lake
- → Quarter Line Lake fishing: DNR survey catch rates, species & stocking
- → Quarter Line Lake fishing forecast & best times (species outlook + 14-day solunar calendar)
- → Quarter Line Lake fishing regulations (limits, seasons, special rules)
- → Is it safe to eat fish from Quarter Line Lake? (mercury & PFAS guide)
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2024).
Water clarity
Stable5 years
Phosphorus
Worsening+2.46 µg/L/yr5 years
EPA Impairment Status
Quarter Line Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit MN69-0869-00 · Official waterbody report
Nearby Lakes in St. Louis County
Frequently asked questions about Quarter Line Lake
Where is Quarter Line Lake?
- Quarter Line Lake is a lake in St. Louis County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Quarter Line Lake?
- Quarter Line Lake in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 4.6 ft visibility. Maximum depth: 22 ft. Surface area: 19.56 acres.
Is Quarter Line Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Quarter Line Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Quarter Line Lake?
- Quarter Line Lake has a maximum depth of 22 feet. The lake covers 19.56 acres.
What fish are in Quarter Line Lake?
- Fish species found in Quarter Line Lake include largemouth bass, northern pike, yellow perch. Quarter Line Lake is located in St. Louis County, Minnesota.
What did the DNR fisheries survey find at Quarter Line Lake?
- Minnesota DNR's Standard Survey on June 25, 2007 caught 11.00 northern pike per gill net at Quarter Line Lake. Length samples in the latest survey that recorded them ran 15–20 inches. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Quarter Line 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 Quarter Line Lake?
- Public access to Quarter Line 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 Quarter Line Lake across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Minnesota Water Science Center
USGS-MN1 sample · 2023
Monitoring station identifiers (1)
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 details from Minnesota DNR LakeFinder