Know Before You Go
Park at the pull-off by the Wachusett Reservoir dam, and continue by foot northeast along route 62. There are the remains of a stone trestle on the right side of the road. Follow the trail to the right of the trestle. The tunnel is just up a small incline. The east end of the tunnel can be muddy and swampy, so waterproof boots are recommended. A flashlight is also recommended. Be careful in summer, the tunnel has standing water and thousands of frogs on the ground.