On Wednesday, July 28, 1869, Campton's Blair Bridge was destroyed by arson.

[2] The current Long truss was constructed in 1870 by Hiram Wesley Merrill for $3,350.

The bridge was damaged during Tropical Storm Irene on August 28, 2011.

The Blair Bridge was restored in 2014 by Arnold M. Graton Associates, Inc. of Holderness for $2,209,704.70.

Tim Dansereau served as project manager, and engineer Sean T. James, P.E., of Hoyle, Tanner & Associates, Inc. of Manchester, served as lead engineer.