Three Mile Lake State Park
🏆 Iowa’s Prairie Lake Getaway — Peaceful Camping, Fishing & Nature on Rolling Grasslands — Updated for 2026 with camping reservations, fishing info, trails, and seasonal guide
Iowa doesn’t do dramatic. It does peaceful. And at Three Mile Lake State Park, peaceful is perfection — a 730-acre prairie lake ringed by grasslands and oak-hickory timber, where the loudest sound is a red-winged blackbird calling from the cattails and the biggest decision of the day is whether to fish from the pier or the canoe. Located in Union County in southern Iowa, Three Mile Lake is the kind of state park that locals treasure and tourists haven’t found yet.
The lake was built in 1983 for recreation and flood control, and today the park offers modern camping, excellent channel catfish and largemouth bass fishing, a swim beach, hiking trails through tallgrass prairie, and the kind of quiet that only the rural Midwest can deliver. If you’re looking for a lake without crowds, a campsite without reservations eight months in advance, and a fishing hole where the catfish cooperate — this is your park.
What Makes Three Mile Lake Charming
Prairie Fishing
730-acre lake with excellent channel catfish, largemouth bass, bluegill, and crappie. Fishing pier and boat ramp.
Modern Camping
Modern campsites with electric hookups near the lake. Rarely crowded — Iowa’s best-kept camping secret.
Tallgrass Prairie
Hiking trails through native tallgrass prairie and oak-hickory timber — Iowa’s original landscape.
Swim Beach
Sandy swim beach for hot summer days — a refreshing prairie lake dip.
Activities
- 🎣 Fishing: Channel catfish, largemouth bass, bluegill, crappie. Fishing pier, cleaned shoreline access, boat ramp
- 🏊 Swimming: Designated swim beach with sandy shore
- 🚤 Boating: Boat ramp for small watercraft. Electric motors and gas motors permitted
- 🚶 Hiking: Multi-use trails through tallgrass prairie and timber. Wildflowers in spring/summer
- 🐦 Birding: Prairie habitat attracts grassland birds — dickcissel, meadowlark, bobolink, red-winged blackbird
- 🦌 Wildlife: White-tailed deer, wild turkeys, and an occasional bald eagle
When to Visit: Seasonal Guide
| Season | Months | Weather | Best For |
|---|---|---|---|
| ☀️ Summer | Jun–Aug | 80-90°F | 🏆 Swimming, full lake recreation, warm camping. Tallgrass prairie in bloom |
| 🍂 Fall | Sep–Nov | 50-70°F | Fishing continues. Fall color in timber. Quiet camping. Hunting season |
| 🌸 Spring | Apr–May | 50-70°F | Wildflowers in prairie. Crappie spawning. Bird migration |
| ❄️ Winter | Dec–Feb | 15-35°F | Ice fishing for crappie and bluegill. Deer and turkey hunting |
Camping
| Feature | Details |
|---|---|
| ⛺ Sites | Modern campsites with 50-amp electric hookups |
| 🚿 Amenities | Modern restrooms, showers, dump station |
| 🏕️ Non-Electric | Basic sites also available at lower cost |
| 📅 Reservations | Iowa DNR reservation system. Many sites first-come, first-served |
Budget Calculator
| Expense | Day Trip | Camping Weekend | Notes |
|---|---|---|---|
| Park Entry | FREE | FREE | Iowa state parks are free to enter |
| Camping (2 nights) | — | $16-26/night | Non-electric to electric sites. Very affordable |
| Fishing License | $8-48 | $8-48 | Iowa fishing license required |
| Total (2 adults) | FREE-$48 | $40-$100 | One of the most affordable parks in America |
Frequently Asked Questions
Is it crowded?
No — Three Mile Lake is one of Iowa’s least crowded state parks. Even summer weekends rarely fill up. It’s a genuine hidden gem.
What fish are in the lake?
Channel catfish are the star — excellent numbers and size. Also largemouth bass, bluegill, crappie, and some walleye.
Can I boat?
Yes — there’s a public boat ramp. Gas motors and electric motors both permitted on the 730-acre lake.
What’s the prairie like?
Native tallgrass prairie — Iowa’s original ecosystem. In summer, grasses reach 6+ feet with wildflowers. Trails wind through it alongside oak-hickory timber.
How do I get there?
Southern Iowa, Union County — about 3 miles east of Afton, IA on Highway 34. About 75 miles south of Des Moines.
🌾 Iowa’s Quietest Lake Secret
Some parks shout. Three Mile Lake whispers. It whispers through tallgrass prairie that sways in the wind like a green ocean. Through mornings so quiet you can hear a bobber hit the water from across the lake. Through sunsets that paint the entire western sky while you sit by your campfire and think about exactly nothing. This is Iowa at its most honest — a prairie lake, a fishing pole, a campsite under the oaks, and the kind of peace that makes you wonder why you spent all that money on the fancy vacation. Three Mile Lake doesn’t have a single thing to prove. That’s why it’s perfect.
📍 Address: Three Mile Lake State Park, Afton, IA 50830
📞 Phone: (641) 347-5798
Frequently Asked Questions
Are Iowa state parks free?
Yes, Iowa state parks are completely free to enter. There are no entrance fees or vehicle permits required. Camping fees apply and reservations can be made through the Iowa DNR.
Can I explore caves at Iowa state parks?
Yes, Maquoketa Caves State Park features over a dozen caves that visitors can explore, including Dancehall Cave with electric lighting. It is one of the most unique state parks in the Midwest.
What are the best state parks in Iowa?
Top parks include Maquoketa Caves (cave exploration), Pikes Peak (bluffs overlooking the Mississippi), Backbone (Iowa’s oldest state park), Ledges (sandstone formations), and Lacey-Keosauqua (scenic river bluffs).
What is the best time to visit Iowa state parks?
Spring and fall offer the most comfortable conditions. Fall foliage peaks in mid-October along the Mississippi River bluffs. Summer is hot but great for camping and water activities. Winter is cold but peaceful.
Explore More Iowa State Parks
Three Mile Lake State Park is one of many outstanding state parks in Iowa. Discover more parks in our Best State Parks in Iowa guide, or use our Park Finder to search by activity, location, or features.
