Franklin County is one of Massachusetts’s least-birded counties. On eBird it ranks as the second-lowest county in the state in species documented and checklists submitted, and its number of birders contributing observations tops only the island counties of Dukes (Martha’s Vineyard) and Nantucket. It also has the lowest population density of any of the mainland counties by a wide margin, and lots of undeveloped habitat that is publicly accessible to the birders who choose to spend time there. I wrote a few years ago about the cluster of birding hotspots along the Connecticut River in Turners Falls, Gill, and Montague (Rose 2016) that tend to draw most of Franklin County’s birding attention because of their track record for hosting a variety of waterfowl and seabirds. West of the river lies a series of sites that specialize in other groups of birds. The sites line up roughly along the Interstate 91 (I-91) corridor but are more easily toured from the slower and more scenic section of U.S. Route 5 where it overlaps with Massachusetts Route 10 for 25 miles, referred to locally as the 5 & 10 Highway.