Big Woods Forest Preserve in Aurora is a 459-acre patchwork of prairie and wetland restorations, woodland, swamps shrub meadows, a lake and stream. It is an undeveloped natural area with fishing adjacent to the Batavia Spur of the Illinois Prairie Path.
Several regionally rare plants grow here, such as trailing ground pine, pagoda dogwood and purple duckweed. Due to its diversity of habitats, a variety of birds forage and nest here, including state and regionally rare species such as the least bittern, black-billed cuckoo, pied-billed grebe, American coot and field sparrow.
A total of 187 vertebrate wildlife species have been found here, including beavers, muskrats, deer, masked shrews, thirteen-lined ground squirrels, garter snakes and northern leopard frogs. Poss Lake is an underutilized fishing spot, and recent surveys have found good numbers of bluegill and largemouth bass. Prairie crayfish, giant floaters and red admiral butterflies are some of the many invertebrates that call the site home..
Big Woods is near the intersection of Eola and Ferry roads south of Butterfield Road (Route 56) and west of Route 59 near Warrenville/Aurora. It does not have a parking lot.
Image © Mark Baldwin
Image © Mark Baldwin
Although Big Woods is undeveloped, the Batavia Spur of the Illinois Prairie Path runs through a southern section of the forest preserve.
You can fish for bluegill and largemouth bass at the 9-acre Poss Lake.
Anglers 16 or older who are not legally disabled must carry valid Illinois fishing licenses. Lake maps and regulations, including creel limits and minimum lengths, are on our Fishing page.
The Forest Preserve District acquired the biggest parcel — 362.17 acres — of Big Woods in 1991. The second largest land acquisition came in 1992 when the District bought an additional 78.66 acres.
Between 2000 and 2015, the District acquired an additional 18 acres. Some of the wetland areas in the preserve were mitigated for nearby road and housing developments.
On This Page
Natural Scene
Driving Directions
Trails
Fishing
History
The preserve is open daily from one hour after sunrise until one hour after sunset. Dogs must be on leashes under 10 feet long, and alcohol is prohibited. Read our Rules & Regulations.
3S580 Naperville Road
Wheaton, IL 60189
Visitor Services
Monday – Friday
8 a.m. – 4 p.m.
Phone: 630-933-7200
Email: forest@dupageforest.org
Police: 630-933-7240
Email: police@dupageforest.org
Contact Our Board