Route 99 is a state highway in Connecticut running for 10.64 miles (17.12 km) from Route 9 in Cromwell, through the town of Rocky Hill, ending in Wethersfield at the Hartford city line. The road continues into Hartford as a local road (Wethersfield Avenue). It follows the former alignment of Route 9 from prior to that route's upgrade to a freeway.

Quick Facts Route 99, Route information ...

Route 99
Map of central Connecticut with Route 99 highlighted in red
Route information
Maintained by CTDOT
Length	10.64 mi[1] (17.12 km)
Existed	1969–present
Major junctions
South end	Route 9 in Cromwell
Major intersections	I-91 in Rocky Hill
North end	US 5 / Route 15 / Wethersfield Avenue in Wethersfield
Location
Country	United States
State	Connecticut
Counties	Middlesex, Hartford
Highway system
Connecticut State Highway System Interstate US State SSR SR Scenic
← Route 97 → Route 100

Close

Route 99 begins as the northbound Exit 25 ramp of Route 9 in Cromwell. At the end of the off ramp, the road continues north as Main Street. (Access from Main Street to the southbound on-ramp for Route 9 is designated as State Road 901). Main Street is a two-lane road that goes north through Cromwell up to Rocky Hill for about 5.6 miles (9.0 km). At the junction with Elm Street (Route 160), the road becomes a four-lane road known as the Silas Deane Highway. The Silas Deane Highway continues through Rocky Hill up to the town of Wethersfield. It serves as the main thoroughfare of these two towns, also providing access to several shopping centers. Route 99 has interchanges with Interstate 91 in Rocky Hill and the Wilbur Cross Highway (Route 15) in Wethersfield. At the Hartford city line, Route 99 ends but the road continues into downtown Hartford as Wethersfield Avenue.^[1]

The entire length of Route 99 is also known as the George Washington Memorial Highway.^[1]

The alignment of Route 99 was originally designated as part of New England Interstate Route 10 in the 1920s. The Silas Deane Highway was built in 1930 and New England Route 10 was shifted slightly west to use the new highway. In the 1932 state highway renumbering, the alignment was re-designated as Route 9. When Route 9 was upgraded to an expressway between I-91 and I-95 in 1969, the old surface alignment became Route 99.^[2]