sentences:  It was built in 1858 by builder Milton Stevens.Town and Howe truss designs were patented by Ithiel Town in 1820 and William Howe in 1840, respectively.The Shushan Bridge employs "the patented Town lattice truss, consisting of top and bottom chords of laminated wood plank, and a web of diagonal wood planks connected by wood trunnels at each point of intersection".