Interstate 691
| Henry D. Altobello Highway | ||||
I-691 highlighted in red | ||||
| Route information | ||||
| Auxiliary route of I-91 | ||||
| Maintained by CTDOT | ||||
| Length | 8.38 mi (13.49 km) | |||
| Existed | 1988 (completed)–present | |||
| NHS | Entire route | |||
| Major junctions | ||||
| West end | I-84 in Southington | |||
| US 5 in Meriden Route 15 / Wilbur Cross Parkway in Meriden | ||||
| East end | I-91 / Route 66 in Meriden | |||
| Location | ||||
| Country | United States | |||
| State | Connecticut | |||
| Counties | Hartford, New Haven | |||
| Highway system | ||||
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Interstate 691 (I-691) is an auxiliary Interstate Highway in Connecticut running from I-84 in Southington east to I-91 in Meriden. According to the Federal Highway Administration, it is 8.38 miles (13.49 km) in length; however, the Connecticut Department of Transportation (CTDOT) includes the 0.54 miles (0.87 km) of the exit ramp that I-691 uses to the merge with westbound I-84, making their recorded length 8.92 miles (14.36 km) long.
I-691 is also known as the Henry D. Altobello Highway for its entire length.