Route 117 begins at an intersection with
US 1 in the village of
Poquonnock Bridge in
Groton. It starts out as Newtown Road then changes to North Road. About a mile north of US 1, Route 117 has an interchange with
I-95 (Exit 88), then continues northward towards the village of
Center Groton, where it meets
Route 184. There is also access to the Star Plaza shopping area near this junction. Route 117 then enters the town of
Ledyard as Center Groton Road. It intersects with
Route 214 in Ledyard Center then continues north for another until the town line with
Preston. In Preston, the road becomes known as Hallville-Poquetanuck Road. Just north of the town line it meets
Route 2A which joins Route 117 as they head north towards
Route 2 in the village of
Hallville. Immediately after crossing Indiantown Brook, Routes 117 and 2A end at Route 2. ==History==