Walnut Hill Wildlife Management Area in Middlefield and Becket provides access to the West Branch Westfield River, a National Wild & Scenic River featuring the longest free-flowing waterway in Massachusetts.

The area is home to two National Historic Landmark keystone arch bridges built in 1840, accessible via the maintained 2. 5-mile one-way Keystone Arch Bridge Trail from Chester.

The 900+ acre WMA offers excellent opportunities for hiking, wildlife viewing, and paddling in a remote, undeveloped landscape within one of the state's largest roadless wilderness areas.