Franklin Creek State Natural Area is located in Lee County, one mile northwest of the village of Franklin Grove and eight miles east of Dixon just north of Illinois Route 38. The beautiful Franklin Creek flows throughout the 664-acre park. Several large natural springs, hardwood forests, bedrock outcroppings, and a large variety of flora and fauna comprise a pristine ecosystem.

Natural Features

The park contains a 198-acre nature preserve which is an outstanding and diverse natural area in a uniquely beautiful setting. High, rocky bluffs shelter a perennial creek and create an environment in which a rich flora and fauna thrive. The preserve represents the initial acquisition by the State of Illinois in the area and, therefore, has been the cornerstone upon which Franklin Creek State Natural Area is built. With its dedication as a nature preserve in 1970, it became the 24th nature preserve in the State of Illinois.

The geology of Franklin Creek is of considerable interest as the valley is deep enough to expose three distinct rock strata. New Richmond sandstone, a soft rock of Lower Ordovician age, is exposed at the bottom of the gorge. This is the oldest rock formation anywhere in the state, dating back to 500 million years ago. Above the New Richmond sandstone lays the Shakopee formation, consisting of sandy dolomite and also being of Lower Ordovician age. This strata is capped with St. Peter sandstone, which is of Middle Ordovician age, approximately 460 million years old. Away from the outcrops along the creek, which have been exposed by erosion, the bedrock is covered with a deep till from the Wisconsin glaciation. Finally, this is mantled with a layer of loess from which the upland soil is developed.

The occurrence of vegetation is influenced by soil characteristics, topography and moisture. Low lying areas along the creek bed support a bottomland forest dominated by silver maple and hackberry. Slippery elm and Kentucky coffee tree also occur here. Ravines support mesic (intermediate between wet and dry) upland forest characterized by sugar maple and basswood. Paw paw, and understory shrub of more southerly distribution, is found here. On drier sites, a dry-mesic forest of white oak, red oak, black oak, shagbark hickory, and hop hornbeam is found.

A small glacial drift hill prairie remnant is present in the preserve. Indian grass and tall dropseed are characteristic plants of this habitat. Other prairie species present include false toadflax, flowering spurge, and hoary puccoon.

High quality, undisturbed cliff communities are present on the bedrock outcrops. Canada yew, an evergreen shrub of more northern woods, is common here. Bladdernut, bishop’s-cap, and shooting star are also found here, as well as several species of ferns.

The forested areas provide habitat for many species of non-game wildlife. Woodpeckers, flycatchers, thrushes, vireos, and warblers are among the breeding birds on the site. The area provides critical stop-over habitat for many more species during migration. Great blue herons and green herons have been observed here. Mammals utilizing the area include raccoons, chipmunks, gray and fox squirrels, beaver, and deer. Shrews, white-footed mice, weasels, and fox may also be seen. Nineteen species of fish have been recorded from Franklin Creek.

Directions:

Franklin Creek State Natural Area is located between Rochelle and Dixon, just north of IL RTE 38. On IL RTE 38 on the west side of the small town of Franklin Grove, turn north on Daysville Road and go one block to Old Mill Road. Turn left (west) on Old Mill Road and proceed one mile to the State Natural Area.

From northerly parts, Franklin Creek State Natural Area is located 10 miles south of Oregon. On IL RTE 64 in Oregon, ½ mile east of the bridge over Rock River is the IL RTE 64/Daysville Road intersection (at the Traffic Light). At this intersection go south on Daysville Road 10 miles to the small town of Franklin Grove. At the northern edge of town, turn right (west) on to Old Mill Road and go one mile to the State Natural Area.


Franklin Creek
1872 Twist Road
Franklin Grove, IL 61031