Area Status: Open

The Illinois Iron Furnace is the only remaining iron furnace structure in the state of Illinois. Iron was manufactured at the Illinois Furnace by the charcoal blast method. The furnace was built on a dry laid limestone foundation. The exterior of the furnace was manufactured of large limestone blocks quarried near the town of Cave-In-Rock. The interior wall, or lining, was constructed of firebrick from Pennsylvania. The space between the interior and exterior walls was filled with sandstone. Wrought iron binders were placed through the stonework and tightened to secure the walls. All of the stonework was dry laid. A 1/2 mile trail leading from the back of the picnic area features bottomland habitat and bottomland tree species. The trail winds along Big Creek and offers 2 or 3 deep old-fashioned fishing holes. Once a site of an iron making blast furnace, the picnic area contains a reconstructed blast furnace as a monument to our nation's past industry.

At a Glance

Restroom: Vault

General Information


From Harrisburg take Highway 34/145 south 6 miles, then continue on Highway 34 south for 16 miles to Highway 146.  Go east on Highway 146 for 3.5 miles to Iron Furnace road, turn north (left) and follow the directional signs to the Iron Furnace historic site.

Recreation Map

Map showing recreational areas. Map Information


Interpretive Areas


Recreation Areas

Recreation Activities


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