Chain O” Lakes (Illinois)
⛵ 6,500 Acres of Interconnected Lakes — Where Chicago Goes Boating — Chain O’ Lakes State Park in Lake and McHenry Counties, Illinois, 6,063 acres, part of the Fox Chain of Lakes system (15 interconnected lakes, 488 miles of shoreline), boating, fishing, camping, swimming, horseback riding, hiking, the largest concentration of lakes in Illinois — Lake/McHenry Counties, IL
An hour northwest of Chicago, 15 lakes connect through a network of natural channels and the Fox River — creating a waterway system with 488 miles of shoreline. This is the Fox Chain of Lakes, the largest chain of lakes in Illinois, and Chain O’ Lakes State Park sits at its center.
This is where Chicago goes boating. On summer weekends, thousands of boats — pontoons, ski boats, bass boats, sailboats, kayaks — fill the interconnected waterways. You can launch in one lake, motor through a channel, and emerge in another. The system stretches 15 miles north to south, and you could spend days exploring without seeing the same shoreline twice.
What to Do
| Activity | Details |
|---|---|
| Boating | Access to 6,500 acres of interconnected water — Grass Lake, Marie Lake, Fox Lake, Nippersink Lake, Pistakee Lake, and 10 more, all connected by channels. Multiple boat launches in the park. The system accommodates everything from canoes to cabin cruisers |
| Fishing | Largemouth and smallmouth bass, walleye, northern pike, muskellunge, channel catfish, crappie, bluegill, and yellow perch. The variety of lake depths and habitats supports exceptional fish diversity. Ice fishing in winter is a major draw |
| Camping | 150 Class A/B campsites with electric hookups, showers, and flush toilets. Group camping available. The campground sits on a wooded ridge above the lake system — you can hear boats on the water from your site |
| Horseback Riding | Dedicated equestrian trails through the park’s oak-hickory forests and prairie grasslands. Equestrian camping area for horse trailer parking. One of the few Illinois state parks with a full equestrian program |
| Hiking | 6+ miles of trails through rolling terrain — oak-hickory woodland, restored tallgrass prairie, and wetland edges. The Gold Finch Trail loops through the best habitat. The Turner Lake Nature Trail follows the shoreline |
| Swimming | Designated swimming beach on Grass Lake — sandy shore, lifeguards in season. The water is warm by July. A welcome cooldown after a day of hiking or riding |
The Lake System
| Feature | Details |
|---|---|
| 15 Lakes | Grass Lake, Marie Lake, Fox Lake, Nippersink Lake, Pistakee Lake, Channel Lake, Catherine Lake, Petite Lake, Bluff Lake, Round Lake, Long Lake, Loon Lake, Lake Villa, Fox Lake, and Turner Lake — all interconnected through natural channels and the Fox River |
| 488 Miles of Shoreline | More shoreline than the shore of Lake Michigan in Illinois. The combination of natural lake edges, wetlands, and developed waterfront creates a complex, diverse system that supports both recreation and wildlife |
| The Fox River | The Fox River — Illinois’s second-longest interior river — threads through the chain, connecting the lakes. The river itself provides additional boating and fishing opportunities. It flows south toward Aurora and eventually the Illinois River |
| Glacial Origin | The lakes formed when the Wisconsin Glacier retreated ~12,000 years ago, leaving depressions in the landscape that filled with water. The same Ice Age that created Wisconsin’s drumlins created Illinois’s chain of lakes |
Best Time to Visit
| Season | Best For |
|---|---|
| Summer (Jun–Aug) | ⛵ Boating peak. Swimming. Fishing all day. The lakes alive with activity. Campfires on warm nights. Chicago’s lake country at its fullest |
| Fall (Sep–Oct) | 🍂 Fall color reflected in 15 lakes. Fishing excellent (bass feeding). Fewer boats. Horseback riding through autumn woods. Cool nights, warm days |
| Winter (Dec–Feb) | Ice fishing on the chain — a major Illinois ice fishing destination. Cross-country skiing on the trails. The lakes frozen, the park quiet |
| Spring (Apr–May) | Walleye and crappie runs. Wildflowers in the prairies. Migrating birds on the lakes. The chain coming alive after winter |
Frequently Asked Questions
How do the lakes connect?
Natural channels and the Fox River link all 15 lakes — you can navigate between them by boat without portaging. The channels vary in width and depth; some require slow-speed transit. Navigation maps are essential and available at the park.
How crowded are the lakes?
Very crowded on summer weekends — this is the closest major lake system to Chicago (4+ million metro residents). Weekdays and early mornings are dramatically quieter. Arrive at boat launches before 8 AM on summer Saturdays.
⛵ 15 Lakes. 488 Miles of Shoreline. All Connected.
Launch in one lake, motor through a channel, emerge in another. Fish for musky at dawn, water ski at noon, camp on the ridge at night. An hour from Chicago — a world away from concrete.
