- Southern Terminus:
- New Milford Turnpike (US 202) in New Preston
- Northern Terminus:
- Kent Road (US 7) in Cornwall
- 10.29 miles
CT 45 is a north/south route in Litchfield County. It begins at New Milford Turnpike (US 202) in New Preston and runs along the east side of Lake Waramaug. Beyond the lake, it continues north through Warren to Cornwall, where it ends at Kent Road (US 7).