Minnesota DNR fisheries surveys · latest July 31, 2025
Swamp Lake FishingNRNot rated for water quality
Minnesota DNR surveys at Swamp Lake average 9.50 northern pike per unit of sampling effort (CPUE) across 3 surveys. The most recent is a Targeted Survey dated July 31, 2025. In Unknown County, Minnesota, Swamp Lake has no letter grade — no EPA ecoregion for this lake, so the National Lakes Assessment condition thresholds cannot be applied. Water clarity averages 16.2 feet of visibility. The survey figures on this page are Minnesota DNR's own; the water-quality grade comes from EPA Water Quality Portal samples. Neither is a forecast of today's bite.
Stocking at Swamp Lake
No stocking record for Swamp Lake appears in the Minnesota DNR material on file. That is an absence in the published record, not a confirmation that the lake is unstocked — some waters are managed as naturally reproducing and never appear in a stocking list at all.
Survey results in full
Minnesota DNR surveys at Swamp Lake average 9.50 northern pike per unit of sampling effort (CPUE) across 3 surveys. The most recent is a Targeted Survey dated July 31, 2025.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Swamp Lake — official chemistry is on file, not a letter, 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).
Top Species by Catch Rate
| Species | Avg catch rate (CPUE) | 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, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE means more abundant in standardized sampling. This 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
Common questions
What fish are in Swamp Lake?
Minnesota DNR surveys at Swamp Lake average 9.50 northern pike per unit of sampling effort (CPUE) across 3 surveys. The most recent is a Targeted Survey dated July 31, 2025. Those are survey results, not a catch report: a net set on one date measures what was in that net.
When was Swamp Lake last surveyed?
The most recent fisheries survey on file for Swamp Lake is dated July 31, 2025. Survey intervals vary by lake and by species; a gap of several years between surveys is normal and does not mean the record is missing.
Is Swamp Lake stocked?
No stocking record for Swamp Lake appears in the Minnesota DNR material on file. That is not the same as a confirmed unstocked lake: it means no stocking document was published for it in the records this page draws on.
Does the water-quality grade tell me how Swamp Lake fishes?
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Swamp Lake — official chemistry is on file, not a letter, 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.
Before you eat what you catch
A water-quality grade is not a consumption advisory. Mercury and PCB advice for Minnesota waters comes from MDH, and it is issued per species and per size class — a lake can grade well and still carry a meal limit on larger predator fish.
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