Lake trip · Union County, Iowa
Where to stay at Twelve Mile Lake
Twelve Mile Lake covers 633 acres in Union County and carries a water-quality grade of F (Very Poor). Compare cabins, resorts, and vacation rentals below, then check the water before you book. Late spring through early fall, with June through August the peak season for swimming, boating, and fishing.
Places to stay near Twelve Mile Lake
Cabins, resorts, hotels, and vacation rentals near Twelve Mile Lake in Union County, Iowa — live availability and prices. Add your dates to see totals.
Top-rated places to stay near Twelve Mile Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Before you book: the water
Twelve Mile Lake grades F for water quality — Very Poor. Avoid swimming, very poor water quality, potential algae toxins. Water clarity is about 2.4 ft of visibility. Algae (chlorophyll-a) measures 45 µg/L.
Best time to visit
Late spring through early fall, with June through August the peak season for swimming, boating, and fishing.
Check the National Weather Service forecast for Twelve Mile Lake →
About Twelve Mile Lake
Camping & RV near Twelve Mile Lake
Search public campgrounds and RV sites near Twelve Mile Lake on Recreation.gov, then compare cabins, resorts, and rentals on the map above.
Common questions
Frequently Asked Questions
Cabins, resorts, and vacation rentals around Twelve Mile Lake in Union County, Iowa are on the map above with live availability and nightly prices. Waterfront rentals put you on the dock; lodging in the nearest town is usually cheaper with more choice.
Twelve Mile Lake has a LakeQuality water-quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Always check local health-department advisories before swimming.
Late spring through early fall, with June through August the peak season for swimming, boating, and fishing.
LakeQuality Lake Trip Planner (2026)
Free trip-planning guide for Twelve Mile Lake: how to pick a clean lake, the water-quality signals that matter, best swimming and fishing windows, and where to stay.
Lodging availability and prices are provided by Stay22 and its booking partners (Booking.com, Vrbo, Expedia); LakeQuality may earn a commission from bookings at no extra cost to you. Water-quality grades are independent of lodging listings. Always check current health-department advisories and managing-agency conditions before you travel.