The park opened with 435 acres in 1970.[5] It was officially named in honor of local newspaperman Raymond J. Callahan by an act of the Massachusetts legislature in 1971.[6]
The park has 7 miles (11 km) of trails for hiking, mountain biking, cross-country skiing, and horseback riding.[4] Dog walking is a common activity.[7] The Bay Circuit Trail crosses through the park. Parking areas are situated on Millwood Street, Edmands Road, and Broadmeadow Road.[8]
^"2012 Acreage Listing"(PDF). Department of Conservation and Recreation. April 2012. Archived from the original(PDF) on June 7, 2017. Retrieved January 19, 2014.
^"Trail Map". Callahan State Park. Department of Conservation and Recreation. Retrieved July 13, 2021.
^ ab"Callahan State Park". Department of Conservation and Recreation. Retrieved July 13, 2021.