Groton — The state Department of Transportation is planning a project to repair a nearly 100-year-old stone masonry wall on Route 1 (West Main Street), right before the intersection where the Baptist church is located in downtown Mystic, according to the DOT and the Town of Groton Facebook page.

DOT will hold a virtual information session at 7 p.m. Thursday.

DOT said the structure, built in 1924, is 232 feet long and is made of mortared stone blocks, a concrete cap and metal pipe rail. The project, expected to be state funded and cost about $1.2 million, entails repairing “the deficiencies associated with the existing metal pipe rail and retaining wall.”

“The proposed rehabilitation consists of replacing the deteriorated concrete cap and pipe rail with a cast-in-place concrete moment slab and crash tested (open) rail system,” a project description states. To meet current guiderail safety requirements for attachments and end treatments, about 6 feet of the wall will be removed to accommodate a roughly 45-foot-long return wall, or secondary wall perpendicular to the main one.

The northbound lane will be reconstructed along the wall length, according to DOT.

DOT said construction is slated to start in the fall of 2021. During the project, traffic on the northbound lane of Route 1 will be detoured through state routes.

Information on how to watch the virtual meeting, including links to the MS Teams Live Event and YouTube project channel, is available at portal.ct.gov/DOTGroton58-335.

People can comment on the project through Sept. 10 by emailing DOTProject0058-0335@ct.gov or leaving a voicemail at (860) 944-1111. The MS Teams Live Event will have a chat function during the question and answer session following the presentation.

People with limited internet access can contact louis.bacho@ct.gov or (860) 594-3212 to request information by mail. They can listen to the meeting by calling (888) 282-0355 and using the participant code 5891744.

People with hearing and/or speech disabilities can dial 711 for Telecommunications Relay Services. The MS Teams Live Event offers closed captioning and translation options. A recording posted to YouTube after the event will offer closed captioning.

A recording will be posted later at portal.ct.gov/dot/general/CTDOT-VPIM-Library.