Swamp Lake
Minnesota109 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Swamp Lake. Here is what has been measured.
- 50 ft max depth
- Limited data
Swamp Lake in Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 16.2 ft visibility. Maximum depth: 50 ft. Surface area: 108.63 acres.
Minnesota DNR's Standard Survey on August 10, 1973 caught 9.50 northern pike per gill net at Swamp Lake. DNR survey details →
Swamp Lake is a 109-acre lake in Unknown County, Minnesota with a maximum depth of 50 feet. 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 2022-06-21. Methodology: how these readings are compared.
What Swamp Lake is good for
From access and monitoring records, not editorial picks.
- Clear water16.2 ft of visibility
- Deep water50 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 Swamp 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 Swamp Lake
These are the measurements Minnesota PCA publishes for Swamp 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 16.2 ft down. TSI 37.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 16.2ft | 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 Swamp Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on August 10, 1973 caught 9.50 northern pike per gill net at Swamp Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Swamp Lake’s water-quality measurements separately, and the water-quality trend over 2 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: 2025-07-31 (Targeted Survey).
3 surveys on file · most recent 2025-07-31 (Targeted Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Tullibee (Cisco) | 13.50 | 1.3 lb | |
| Northern Pike | 9.50 | 2.39 lb | |
| Rock Bass | 3.25 | 0.22 lb | |
| White Sucker | 3.25 | 1.78 lb | |
| Largemouth Bass | 0.50 | 1.8 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 2025-07-31 survey
Temperature and dissolved oxygen measurements were collected from the deepest basin in Ashdick Lake on July 31st, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Cisco, also known as Tullibee, the most sensitive coldwater species present in…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Swamp Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — AshdickFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
50 ft
Surface area
109 acres
Shoreline
3.9 mi
Littoral zone
58%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
916 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,434 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Swamp Lake
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Top-rated places to stay near Swamp Lake
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Fishing Swamp Lake
Water quality readings over time
2 seasons of samples on record (2020–2022). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Stable2 years
Nearby Lakes in Minnesota
Frequently asked questions about Swamp Lake
Where is Swamp Lake?
- Swamp Lake is a lake in Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Swamp Lake?
- Swamp Lake in Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 16.2 ft visibility. Maximum depth: 50 ft. Surface area: 108.63 acres.
Is Swamp Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Swamp Lake?
- Swamp Lake has a maximum depth of 50 feet. The lake covers 108.63 acres.
What did the DNR fisheries survey find at Swamp Lake?
- Minnesota DNR's Standard Survey on August 10, 1973 caught 9.50 northern pike per gill net at Swamp Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Swamp Lake’s water-quality measurements separately, and the water-quality trend over 2 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Swamp Lake?
- Public access to Swamp 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 Swamp Lake across LakeQuality
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Where this data comes from
2 measurements from 2 monitoring stations, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA2 samples · 2020–2022
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (2)
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