Minnesota DNR fisheries surveys · latest May 31, 2022
Species recorded at Union Lake
15 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 Union Lake
No stocking record for 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.
Getting on the water
1 public boat landing is recorded on Union Lake. Minnesota DNR lists the public access sites, including ramp type and parking, in the documents below.
Survey results in full
Minnesota DNR's Standard Survey on July 24, 2017 caught 0.75 walleye per gill net at Union Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Union Lake’s water-quality measurements separately, and the water-quality trend over 3 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
15 surveys on file from MN DNR Fisheries. Most recent: 2022-05-31 (Targeted Survey).
15 surveys on file · most recent 2022-05-31 (Targeted Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Bluegill | 38.06 | 2–8 in 2022-05-31 | 0.2 lb |
| Black Crappie | 9.46 | 3–12 in 2022-05-31 | 0.23 lb |
| Yellow Perch | 6.90 | 5–7 in 2017-07-24 | 0.1 lb |
| Black Bullhead | 6.34 | 7–12 in 2017-07-24 | 0.51 lb |
| Largemouth Bass | 4.66 | 3–20 in 2017-07-24 | 1.21 lb |
| Yellow Bullhead | 4.02 | 8–12 in 2017-07-24 | 0.61 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.
Bluegill
Black Crappie
Yellow Perch
Black Bullhead
From the 2022-05-31 survey
Union is a small-sized lake (93 acres) located southwest of the City of South Haven in Wright County. Union has 1.5 miles of shoreline and a maximum depth of 35 feet. A state-owned public access with a cement boat ramp and a very small amount of parking is present on the south shore. Water clarity is typically fair to…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Union Lake. 3 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — UnionFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Union (2022)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — UnionPublic Water Access Sites · MN DNR LakeFinder
Common questions
What fish are in Union Lake?
Minnesota DNR's Standard Survey on July 24, 2017 caught 0.75 walleye per gill net at Union Lake. Minnesota DNR lists 15 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 Union Lake last surveyed?
The most recent fisheries survey on file for Union Lake is dated May 31, 2022. 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 Union Lake stocked?
No stocking record for 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.
Do the water-quality readings tell me how Union Lake fishes?
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Union Lake’s water-quality measurements separately, and the water-quality trend over 3 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
Water-quality readings are 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 with clear, low-nutrient water can still carry a meal limit on larger predator fish.
Where to stay near Union Lake
Top-rated places to stay near Union Lake
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