That 2nd bridge you see at the Keystone Arch Bridges Trail…was once a stone arch like the others, taking a closer look the right side abutment is still stone blocks however this bridge is now primarily newer construction. Take a left after the gate onto the Pontoosuc Turnpike (also see the turnpike road bed wall of rocks)and see two cellar holes on your left, a short trail takes you to the river bank. This is Keystone Arch #2.

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