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Union Lake

Polk County - Minnesota
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Frequently Asked Questions About Union Lake, MN


How big is Union Lake?
Union Lake is approximately 887 sq acres (3.6 sq km) in size with 15 miles (24.1 km) of shoreline.

How deep is Union Lake?
Union Lake is approximately 83 feet (25.3 m) at its deepest point.

What kind of fish can you catch in Union Lake?
Although thery may be others but anglers can expect to find a variety of fish including Black Bullhead, Black Crappie, Bluegill, Brown Bullhead, Carp, Largemouth Bass, Northern Pike, Pumpkinseed, Rock Bass, Walleye and Yellow Perch in Union Lake.

Other fish species in the lake include Bluntnose Minnow, Central Mudminnow, Green Sunfish, Hybrid Sunfish, Iowa Darter, Spottail Shiner, Tadpole Madtom and White Sucker.



What are the closest cities to Union Lake?
Nearby cities and towns include Winger, MN, Erskine, MN and McIntosh, MN.

Are there places to stay in the Union Lake area?
Are you craving a weekend escape from the hustle and bustle of city life? Or maybe you're an avid angler in search of the perfect fishing spot? Look no further! Union Lake and its surrounding area offer an abundance of options to suit your needs. If you're in need of accommodation, check out our area map which highlights some of the best places to stay. And if you're looking for even more options, head on over to our Travel section. But why settle for a traditional hotel or resort when you can take your adventure to the next level by renting a RV? The open road awaits you!
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Are there topographical lake maps available Union Lake?
We have an topograpical map for online viewing near the top of this page. Lake-Link Pro users can download an print a topograpical map of Union Lake (.pdf format) along with 2,700 more lake maps. For more information on all the benefits of Lake-Link Pro click here.

Are there boat launches on Union Lake?
We know of 2 public boat launches on Union Lake. Please observe any specific lake regulations posted by the boat launch and please help keep the launch area free of litter.

Are there places to eat and drink near Union Lake?
Yes, you can find numerous options in the area. Click the button below to see what's nearby.

Explore the Union Lake area in a RV
Are you looking for an adventurous vacation option that won't break the bank? Look no further than renting an RV! Contrary to popular belief, the process is much simpler than you might imagine. With just a few easy steps, you'll soon be experiencing the ultimate freedom and convenience of exploring the open road in your very own recreational vehicle. And the best part? RV travel can save you up to 60% compared to other types of vacations! With the money you'll save, you'll be able to travel even more and create unforgettable memories along the way. So why wait? Start planning your next adventure today with an RV rental. Learn more about renting a RV.

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What aquatic invasive species are found in Union Lake?
There are some aquatic invasive species found in Union Lake including Eurasian watermilfoil.

Join us in the fight to prevent the spread of invasive species These sneaky creatures can hitch a ride on boats, clinging onto propellers, anchor lines, and trailers. They can even survive in hidden places like bilge water and ballast tanks, or disguise themselves in dirt and sand that sticks to nets, buckets, anchors, and waders. But don't worry, we have the power to stop them in their tracks with just a few simple steps. So let's do our part and protect our waters from these unwanted invaders.


History & Status of the Fishery

Union Lake is an 887-acre lake located in south central Polk County. The lake has a history of large fluctuations in water levels, which are influenced primarily by ground water. The most recent water level rises in the late 1990's resulted in the formation of a lake improvement district (LID) made up of riparian owners on both Sarah and Union lakes. The LID facilitated construction of a pumped outlet to the Sand Hill River watershed, following property damage along the lake's shoreline. A standard fisheries survey was conducted in early August 2022 to assess the fish populations at Union Lake.

Following a record high abundance of Walleye in 2012, Walleye gill net catch rates have declined in recent years. However, the 2022 catch rate of 6.3 Walleye per gill net is only slightly below the lake's historical average of 6.8 per net. Lengths of sampled Walleye ranged from 7.7 to 30.1 inches with an average of 19.0 inches. The Northern Pike gill net catch rate set a record high in 2022 at 11.9 fish per net. The historic average is 6.1 fish per net. Sampled Northern Pike ranged from 15.1 to 32.0 inches with an average of 21.9 inches. About 23% of the fish sampled were over 24 inches in length.

The trap net catch of Bluegill was well below average in 2022 with a catch rate of 8.3 Bluegills per net. The historical average for the lake is 36.6 per net. These fish averaged 6.0 inches in length and ranged from 3.3 to 8.4 inches. Black Crappie abundance increased slightly from recent surveys with trap nets capturing 3.6 per net. Black Crappie sampled in trap nets had an average size of 8.7 inches, but individuals up to 12.1 inches long were encountered. Gill nets caught Largemouth Bass at 1.8 fish per net. Largemouth Bass averaged 11.5 inches long, with Largemouth Bass up to 18.1 inches long measured. Yellow Perch abundance was low in 2022, with fish having an average length of 6.3 inches. Trap net catches of Common Carp were similar to past surveys, but gill nets captured a record number of fish in 2022. Other fish species sampled in 2022 included Black and Brown Bullhead, Pumpkinseed, and White Sucker.


What is the average air temp for Union Lake?
Looking forward to your next adventure at Union Lake? Don't forget to plan ahead! Weather can be unpredictable, but we've got you covered. On average, air temperatures during this time of year range from a high around 82°F (28°C) to a low around 60°F (16°C). Of course, these are just historical averages, so be prepared for anything Mother Nature throws your way. For the most up-to-date weather information, be sure to check out our Weather Bar located at the top of this page.

Union Lake Reviews
Below is the word on street about Union Lake.
Have you been to Union Lake? Why not share your personal reveiw with others?
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chris d.
3 star rating
Walleye Fishing Has Improved In The Last Few YEARS..PANFISH Are Pletiful But Small...
Reviewed Feb 13, 2000

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DISCLAIMER: Lake-Link Inc assumes no responsibility or liability for any errors or omissions of the information for Union Lake. Although we strive to provide the most accurate information as we can the information contained in this page is provided on an "as is" basis with no guarantees of completeness, accuracy, usefulness or timeliness.

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