Estuary Transit District

River Valley Transit
A River Valley Transit bus in the former 9 Town Transit branding on the 643 route in New London
Formerly9 Town Transit, Middletown Area Transit
ParentEstuary Transit District
FoundedMay 1981 (9 Town Transit)
July 2022 (merger)
Headquarters91 N Main St, Middletown, Connecticut
Service areaLower Connecticut River Valley
Service typeLocal bus
Dial-A-Ride
XtraMile Microtransit
ADA Paratransit
Routes12
HubsOld Saybrook station
Middletown Bus Terminal
OperatorEstuary Transit District, managed by First Transit
WebsiteOfficial website

Estuary Transit District, doing business as River Valley Transit, is the public transit provider for the Lower Connecticut River Valley region. ETD provides bus service in the municipalities of Chester, Clinton, Durham, Deep River, East Haddam, East Hampton, Essex, Killingworth, Haddam, Lyme, Old Lyme, Old Saybrook, Portland, Westbrook, Middlefield, Middletown, and Madison. It was formed in 2022 by the merger of the Estuary Transit District (dba 9 Town Transit) and Middletown Area Transit.