Interstate 691 Connecticut
Overview
Interstate 691 branches east from I-84 along the Cheshire and Southington town line along a rural course to Crow Hollow along the Hanging Hills. Passing south of Cathole Mountain, the freeway enters the urban area of Meriden and continues north of the city center. I-691 connects with Route 15 (Wilbur Cross Parkway), Interstate 91 and Route 66 west of Higby Mountain. Route 66 east extends the freeway north of Beseck Mountain into the town of Middlefield.
Mileage by State
| Connecticut | 8.38 mi |
Data Sources
December 31, 2025 Interstate Route Log and Finders List
History
Interstate 691 began as a freeway for U.S. 6A between Exits 8 and 13 in 1965. By 1969, the designation shifted from U.S. 6A to Connecticut Route 66, with construction extending the road west to Exit 4 by 1970. Interstate 691 was established by the American Association of State Highway and Transportation Officials ( AASHTO) along with I-284 in Hartford on July 13, 1976. I-691 however was not signed until 1987, one year prior to the completion of its connection to Interstate 84 (Anderson, n.d.).
Mileage by State
| Connecticut | 8.38 mi |
Data Sources
December 31, 2025 Interstate Route Log and Finders List
East End 
‐ Meriden, CT
East at 
Interstate 691 enters a parclo interchange (Exit 8) with U.S. 5 (Broad Street) one mile from Exit 10 for Route 15 south to I-91 south. 05/30/22
West at
Route 66 (Meriden Road) expands into an expressway west from the Mattabesett Trail head for Higby Mountain. The wye interchange (Exit 13) with E Main Street (historic U.S. 6 Alternate) follows. 05/30/22
North at
I-91 and Route 15 (Wilbur Cross Parkway) run side by side north from a wye interchange adjacent to an area of wetlands along Willow Brook to Exit 16 / E Main Street before parting ways for I-691/Route 66. 05/30/22
South at
I-91 crosses into the city of Meridan southwest from Higby Mountain in Middletown ahead of Exit 18 for Interstate 691 west. 05/30/22
West End 
‐ Cheshire, CT
West at
I-691 separates into ramps (Exits 2/1) for Interstate 84, 0.75 miles beyond the Route 10 (Highland Avenue) overpass in north Cheshire. 05/31/22
East at
Interstate 84 traverses the foothills south of Stonington Mountain leading east to Exit 27 for I-691. 05/30/22
West at
The directional T interchange (Exit 27) with Interstate 691 east expands over the folded diamond interchange (Exit 28) with Route 322 (Meriden-Waterbury Turnpike) at the Stonington neighborhood of Marion. 05/30/22
