Frog Lake
Lake County, Minnesota53 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Frog Lake. Here is what has been measured.
- 38 ft max depth
- Limited data
Frog Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 10.5 ft visibility. Maximum depth: 38 ft. Surface area: 53.19 acres.
Minnesota DNR's Standard Survey on June 26, 2000 caught 5.00 northern pike per gill net at Frog Lake. Length samples in the latest survey that recorded them ran 24–31 inches. DNR survey details →
Frog Lake is a 53-acre lake in Lake County, Minnesota with a maximum depth of 38 feet. Overall water quality is improving 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 2025-06-11. Methodology: how these readings are compared.
What Frog Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
- Fishing3 species recorded
- Deep water38 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 Frog 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 Frog Lake
These are the measurements Minnesota PCA publishes for Frog 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 10.5 ft. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10.5ft | 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. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Frog Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on June 26, 2000 caught 5.00 northern pike per gill net at Frog Lake. Length samples in the latest survey that recorded them ran 24–31 inches.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Frog Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 2000-06-26 (Standard Survey).
1 survey on file · most recent 2000-06-26 (Standard Survey)
26 years old| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Yellow Perch | 23.00 | 6–10 in 2000-06-26 | 0.18 lb |
| Largemouth Bass | 9.00 | 7–16 in 2000-06-26 | 1.31 lb |
| Northern Pike | 5.00 | 24–31 in 2000-06-26 | 6.02 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.
Yellow Perch
Largemouth Bass
Northern Pike
From the 2000-06-26 survey
Frog Lake is in Ecological Lake Class 4, which consists of 47 lakes in northeast Minnesota that are small, deep, and have very clear and soft (unmineralized) water. Frog Lake differs from most of the lakes in this lake class in that it is shallower (38 ft) than the lake class average of 61 ft. Frog Lake ranks as…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Frog Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — FrogFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
38 ft
Surface area
53 acres
Shoreline
1.8 mi
Littoral zone
40%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,398 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Frog Lake
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Top-rated places to stay near Frog Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Frog Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2020–2025).
Water clarity
Improving5 years
Nearby Lakes in Lake County
Frequently asked questions about Frog Lake
Where is Frog Lake?
- Frog 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 Frog Lake?
- Frog Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 10.5 ft visibility. Maximum depth: 38 ft. Surface area: 53.19 acres.
Is Frog Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Frog Lake?
- Frog Lake has a maximum depth of 38 feet. The lake covers 53.19 acres.
What fish are in Frog Lake?
- Fish species found in Frog Lake include largemouth bass, northern pike, yellow perch. Frog Lake is located in Lake County, Minnesota.
What did the DNR fisheries survey find at Frog Lake?
- Minnesota DNR's Standard Survey on June 26, 2000 caught 5.00 northern pike per gill net at Frog Lake. Length samples in the latest survey that recorded them ran 24–31 inches. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Frog Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Frog Lake?
- Public access to Frog 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 Frog Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA4 samples · 2023–2025
Analytical methods
- Field measurement/observation, generic method
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder