Minnesota DNR fisheries surveys · latest August 8, 2018
North Union Lake FishingAWater-quality grade A
Minnesota DNR surveys at North Union Lake average 21.40 bluegill per unit of sampling effort (CPUE) across 7 surveys. The most recent is a Standard Survey dated August 8, 2018. Length samples in the latest survey that recorded them ran 4–8 inches. In Douglas County, Minnesota, North Union Lake carries an overall water-quality grade of A. Water clarity averages 20.3 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.
Species recorded at North Union Lake
13 species on the Minnesota DNR list for this lake. A species on the list has been recorded here; it does not mean it is catchable today or in every part of the lake.
Stocking at North Union Lake
No stocking record for North Union 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 North Union Lake average 21.40 bluegill per unit of sampling effort (CPUE) across 7 surveys. The most recent is a Standard Survey dated August 8, 2018. Length samples in the latest survey that recorded them ran 4–8 inches.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades North Union Lake A from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
7 surveys on file from MN DNR Fisheries. Most recent: 2018-08-08 (Standard Survey).
Top Species by Catch Rate
| Species | Avg catch rate (CPUE) | Avg Weight |
|---|---|---|
| Bluegill | 21.40 | 0.2 lb |
| Black Bullhead | 8.12 | 1 lb |
| Yellow Bass | 7.77 | 0.67 lb |
| Pumpkinseed | 5.98 | 0.29 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.
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.
Bluegill
Black Bullhead
Yellow Bass
Pumpkinseed
From the 2018-08-08 survey
North Union, Stony, and Lottie (Taylor) lakes form a chain of lakes between Brophy and Cowdry Lakes in Douglas County. North Union Lake is the upper or first lake in this chain of interconnected lakes. Brophy Lake discharges into North Union. North Union outlets to Stony Lake. None of these three small basins have…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for North Union Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — North UnionFisheries Lake Survey · MN DNR LakeFinder
Common questions
What fish are in North Union Lake?
Minnesota DNR surveys at North Union Lake average 21.40 bluegill per unit of sampling effort (CPUE) across 7 surveys. The most recent is a Standard Survey dated August 8, 2018. Length samples in the latest survey that recorded them ran 4–8 inches. Minnesota DNR lists 13 species for the lake in total. Those are survey results, not a catch report: a net set on one date measures what was in that net.
When was North Union Lake last surveyed?
The most recent fisheries survey on file for North Union Lake is dated August 8, 2018. 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 North Union Lake stocked?
No stocking record for North Union 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 North Union Lake fishes?
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades North Union Lake A from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is declining. 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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