keystone arch

keystone arch

Any arch having a keystone at its center, but commonly a flat arch or a round-topped arch.
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3) This keystone arch at the Upper Barton Mill site once topped the channel that let water flow from the power wheel back to the French River.
BECKET- CHESTER- MIDDLEFIELD- REHABILITATION OF B-03-017=M-19-017 & B-03-018=M-19-018, OLD "WESTERN RAILROAD" KEYSTONE ARCH BRIDGES OVER THE WESTERN BRANCH OF WESTFIELD RIVER
This project will result in the restoration of two historic Keystone Arch Bridges, located in Becket and Middlefield, for public enjoyment and historic preservation.

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