Buffalo Rock State Park & Effigy Tumuli in Illinois, USA - map and visitor information

Research checked: 2026-11-01. Check linked official notices before travel.

Buffalo Rock State Park sits above the Illinois River west of Ottawa, Illinois. Combine bluff viewpoints, the Effigy Tumuli earth sculptures and a picnic. The short visit works well as a separate stop from the larger canyon parks around Utica.

See the river, land art and resident bison

Effigy Tumuli comprises five earthen animal forms: snake, turtle, catfish, frog and insect. The state tourism office identifies them as sculptures made from Illinois clay. The park also has two American bison in a pen and grazing area near the baseball diamond.

Know before you go

Fees, hours, and seasonal access

Use the designated viewpoints

The River Bluff Trail runs high above the Illinois River and has two observation decks. Use those decks for river views and supervise children around the bluff. Check IDNR closure notices before choosing your route.

Keep pets leashed

Pets must stay on a leash. Watch the bison from visitor areas and give other trail users room to pass.

Choose the right picnic shelter

The larger shelter has a stone fireplace and can be reserved. The smaller shelter operates first come, first served. Contact the park when your group depends on the larger space.

Arrive from Ottawa or Utica

Use 1300 North 27th Road, Ottawa, IL 61350. From Ottawa, follow Route 6 to W.D. Boyce Memorial Drive, then Ottawa Avenue, which becomes Dee Bennett Road. From Utica, the agency directs visitors east along Dee Bennett Road for five miles. The canal trail access lies across the road from the park.

Two parks around Utica

Starved Rock State Park has its visitor center by the main parking lot through the west entrance off Route 178. Matthiessen State Park is about four miles south of Utica. Matthiessen closes to nonhunters November 20–22, December 3–6 and December 11–13 during the posted 2026 deer hunts. Its Lake Falls bridge trail is also closed with a detour.

Choose a bluff walk or woodland outing

Follow River Bluff Trail for river views, then use Woodland Trail for a closer look at trees and plants. Walk around the earth sculptures as a separate part of the outing. For a longer canal walk, the opposite access area has space for about seven vehicles, but no water or toilets.

Picnic services and accessible amenities

Picnic tables, grills, drinking water and restrooms support a meal stop. A playground stands near the larger shelter. The accessibility information identifies asphalt accessible parking, an accessible vault toilet in the western lot and accessible shelters with grills and tables. The main lot has a flush toilet. These facility details do not establish that every trail is accessible.

About the bluff-top park

From employee retreat to state park

The Crane Company bought Buffalo Rock in 1912 and used it for an employee sanatorium and vacation grounds. The property deed passed to Illinois on November 15, 1928, with a requirement that it remain a state park.

Woodland shade around the picnic grounds

Mature oak, hickory and walnut trees shade the picnic areas. The resident bison are enclosed animals, distinct from wildlife encountered on a woodland walk.

Contact

Call the park agency at 815-433-2224. The official park page provides current visitor information.