Within the 240 acre parcel historic site are the Sanilac Petroglyphs, Michigan's only known prehistoric rock carvings attributed to Native American workmanship in the Lower Peninsula of Michigan.

The Petroglyphs will be open for viewing Friday, Saturday and Sunday, 10AM-5PM through September 25 (please call to confirm hours and dates). The archaeological site may also be available for a special viewing during the rest of the year via a Use Permit. Contact the park at 989-856-4411 and ask to speak to the park supervisor. The rest of the park contains a one mile hiking trail that crosses the Little Cass River in two places. The trail is open from 8 a.m. to 10 p.m. year-round. Send any correspondence to Sleeper State Park, 6573 State Park Rd, Caseville MI 48725.

Make a Tax Deductible Donation to Sanilac Petroglyphs Historic State Park