The Steep Rock Association and the Roxbury Land Trust will co-host a 4 ½-mile inter-town hike along Tunnel Road in Washington Oct. 5 from 1 to 3:30 p.m. In case of inclement weather, the event would be held Oct. 6.

The town road, which connects protected lands owned by the two organizations, has been integrated into Steep Rock Preserve’s trail system and sees more tread from boots and horseshoes than tires nowadays.

The group will take a slight detour off Tunnel Road to investigate the tunnel itself, a 235-foot passage through bedrock, from which the road received its name.

The program will start at SRA’s main Steep Rock Preserve parking lot next to the riding ring at 2 Tunnel Road, Washington and finish at RLT’s Battle Swamp Preserve on Judd’s Bridge Road in Roxbury.

A shuttle bus will then bring all participants back to Washington, concluding the program.

Participants should wear appropriate footwear for a moderate hike with one steep climb and have plenty of water on hand.

Registration is required at due to shuttle capacity.