AMP: 2 Location: River Rd and Town St, East Haddam No signage as SSR 431 begins. 431 exists to serve Gillette Castle State Park. AMP: 1 Location: River Rd at Gillette Castle, East Haddam SSR 431 is a pleasant drive. AMP: 0 Location: River Rd at Gillette Castle, East Haddam With .8 miles to go, … Continue reading Connecticut Special Service Road 431, CT 82 to CT 148