Union Lake fishing: Northern Pike, Largemouth Bass, Walleye
Target species: Northern Pike, Largemouth Bass, Walleye, Bluegill, Black Bullhead, White Sucker, Black Crappie
Boat: 1 ramp or launch on file for this water.
Start here: Launch at Union Lake, West Public Water Access Site, 1 lane.
The lake
Union Lake covers 799 acres in Minnesota, across Polk County. It is a lake: 90.8% of it is 40 feet deep or less; the deepest point measured is at least 80 feet (24.4 m). Our records hold 11 species for this water.
Depth and bottom
Deepest measured point: at least 80 ft (24.4 m). That is the deepest contour line: the bottom goes deeper. 90.8% of the water is 40 feet or shallower. We hold 60 depth contour lines for this water.
- 0–5 ft: 21% of the water
- 5–10 ft: 17.6% of the water
- 10–15 ft: 11.8% of the water
- 15–20 ft: 10.7% of the water
- 20–25 ft: 12.4% of the water
- 25–30 ft: 5.9% of the water
- 30–35 ft: 4.7% of the water
- 35–40 ft: 6.7% of the water
- 40–45 ft: 5.6% of the water
- 45–50 ft: 2.3% of the water
- 50–55 ft: 0.7% of the water
- 55–60 ft: 0.5% of the water
- 60–65 ft: 0.3% of the water
7 target fish, led by Northern Pike
- Northern Pike — Feeding water: 50–75°F.
- Largemouth Bass — Feeding water: 65–85°F.
- Walleye — Feeding water: 50–75°F.
- Bluegill — Feeding water: 70–85°F.
- Black Bullhead — Feeding water: 70–80°F.
- White Sucker — Feeding water: 50–70°F.
- Black Crappie — Feeding water: 65–75°F.
Also recorded here: Yellow Perch, Pumpkinseed, Brown Bullhead, Common Carp.
Water and conditions
Our water temperature readings average 72°F; they do not cover the whole year, so this is not a yearly average. These readings span 2016–2025.
1 ramp or launch on this water
On this water we hold 1 trailer ramp and 1 shore access point.
- Union Lake, West Public Water Access Site — 1 lane, restrooms. DNR Division of Parks and Trails.
Shore access for bank fishing
- Union Lake, East Public Water Access Site — Polk County.
Fee and opening hours are blank for all 2 places in this list: a blank means we hold no such field, not that it is free or always open, and this list may not be complete.
What is hard here
Only 1 public ramp is on file, so the launch decides where you fish.
Where this data comes from
- Minnesota DNR — Minnesota DNR: depth contours: class A, a survey of the bottom.
- Minnesota DNR — Minnesota DNR: reported depths: class B, a depth figure measured and published by an agency, without a bottom map.
- Webster, K.E., McCullough, I.M., Soranno, P.A. LAGOS-US DEPTH v1.0, EDI, doi:10.6073/pasta/64ddc4d04661d9aef4bd702dc5d8984f (CC BY 4.0); Cheruvelil et al. LAGOS-US LOCUS v1.0 (EDI) — LAGOS-US DEPTH v1.0: Lake depth for 17,675 lakes in the conterminous U.S.: class B, a depth figure measured and published by an agency, without a bottom map.
