Minnesota DNR fisheries surveys · latest June 15, 1987
Mary Lake FishingNRNot rated for water quality
Minnesota DNR surveys at Mary Lake average 6.42 northern pike per unit of sampling effort (CPUE) across 2 surveys. The most recent is a Standard Survey dated June 15, 1987. In Itasca County, Minnesota, Mary Lake has no letter grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Water clarity averages 10.5 feet of visibility, and the lake has public access. 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 Mary Lake
No stocking record for Mary 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 Mary Lake average 6.42 northern pike per unit of sampling effort (CPUE) across 2 surveys. The most recent is a Standard Survey dated June 15, 1987.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Mary Lake — official chemistry is on file, not a letter, and the water-quality trend over 2 years of monitoring is improving. 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: 1987-06-15 (Standard Survey).
Top Species by Catch Rate
| Species | Avg catch rate (CPUE) | Avg Weight |
|---|---|---|
| Bluegill | 12.60 | 0.19 lb |
| Northern Pike | 6.42 | 1.75 lb |
| Yellow Perch | 2.50 | 0.12 lb |
| Black Crappie | 2.49 | 0.39 lb |
| Pumpkinseed | 1.67 | 0.18 lb |
| Rock Bass | 1.30 | 0.52 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 1987-06-15 survey
NET CATCHES INDICATE THAT NORTHERN PIKE POPULATION ABOVE STATE AND LOCAL MEDIANS. BLUEGILLS ARE ABUN- DANT, BUT SMALL. OTHER SPECIES AT LEVELS COMPAR- ABLE TO OTHER LAKES OF THIS TYPE.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Mary Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — MaryFisheries Lake Survey · MN DNR LakeFinder
Common questions
What fish are in Mary Lake?
Minnesota DNR surveys at Mary Lake average 6.42 northern pike per unit of sampling effort (CPUE) across 2 surveys. The most recent is a Standard Survey dated June 15, 1987. Those are survey results, not a catch report: a net set on one date measures what was in that net.
When was Mary Lake last surveyed?
The most recent fisheries survey on file for Mary Lake is dated June 15, 1987. 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 Mary Lake stocked?
No stocking record for Mary 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 Mary 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 Mary Lake — official chemistry is on file, not a letter, and the water-quality trend over 2 years of monitoring is improving. 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.
Where to stay near Mary Lake
Top-rated places to stay near Mary Lake
Planning a trip to Mary Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Mary Lake — straight to your inbox. No spam, unsubscribe anytime.