Connecticut Route 166

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Route 166

Spencer Plain Road
Map of Middlesex County in southern Connecticut with Route 166 highlighted in red
Route information
Maintained by CTDOT
Length1.62 mi[1] (2.61 km)
Major junctions
West end Route 153 in Westbrook
Major intersections I-95 / Conn. Turnpike in Old Saybrook
East end US 1 in Old Saybrook
CountryUnited States
Highway system
  • Connecticut State Highway System
Route 165 Route 167

Route 166 is a minor state highway in southern Connecticut running from Westbrook to Old Saybrook. The route primarily serves as a connector from I-95 to the Saybrook Manor section of Old Saybrook.

Route description

Route 166 begins at an intersection with Route 153 in the eastern part of the town of Westbrook. It heads east, roughly paralleling I-95 on the north, into the town of Old Saybrook. Along the way, it passes by the Westbrook Block company just before crossing the town line. In Old Saybrook, it turns south, crossing I-95 along the Rosario Aloisio Memorial Bridge, with an interchange at exit 66. It continues southeast over the Amtrak Northeast Corridor line to end at an intersection with US 1 in the western part of Old Saybrook. The entire route is known as Spencer Plain Road and is classified as a minor arterial road carrying average daily volumes of 5,600 vehicles per day.[1]


Route 166 was established from town roads in 1935, and has had no major changes in alignment or designation since.[2]

Junction list

The entire route is in Middlesex County.

Westbrook0.000.00 Route 153 – Westbrook, Essex, Deep River
Old Saybrook1.292.08 I-95 / Conn. Turnpike – New Haven, New LondonExit 66 (I-95/Connecticut Turnpike)
1.622.61 US 1 – Downtown Old Saybrook, WestbrookEastern terminus of CT 166
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


External links