Connecticut Route 99

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Route 99 marker

Route 99
Route information
Maintained by ConnDOT
Length: 10.64 mi[1] (17.12 km)
Existed: 1969 – present
Major junctions
South end: Route 9 in Cromwell
  I‑91 in Rocky Hill
US 5 / Route 15 in Wethersfield
North end: Wethersfield-Hartford town line
Highway system
Route 97 Route 100

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.

Route description[edit]

Route 99 begins as the northbound Exit 18 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]

Special designations[edit]

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]

On the route[edit]

In Cromwell, the Middletown Upper Houses Historic District was designated part of the National Register of Historic Places on July 27, 1979.

Junction list[edit]

County Location Mile[1] km Destinations Notes
Middlesex Cromwell 0.00 0.00 Route 9 – Old Saybrook, New Britain Route 9 exit 18, trumpet interchange
0.97 1.56 Route 372 west – Berlin
Hartford Rocky Hill 5.19 8.35 West Street (SSR 411)
5.94 9.56 Route 160 – Berlin, South Glastonbury
7.11 11.44 I‑91 – Hartford, Meriden I-91 Exit 24
Wethersfield 8.48 13.65 Route 3 – Glastonbury, Rocky Hill
9.03 14.53 Route 175 west – Newington
10.33 16.62 Route 314 south – Newington
10.39 16.72 US 5 / Route 15 – Newington, Hartford
10.64 17.12 Wethersfield Avenue (local)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


External links[edit]

Route map: Google / Bing