8 2 , ▁the ▁American ▁Society ▁of ▁Civil ▁Engine ers ▁designated ▁it ▁as ▁a ▁National ▁Historic ▁Civil ▁Engineering ▁Land mark . ▁On ▁September ▁ 8 , ▁ 1 9 8 2 , ▁the ▁bridge ▁was ▁designated ▁a ▁Michigan ▁State ▁Historic ▁Site ▁and ▁an ▁inform ational ▁marker ▁was ▁ere cted ▁in ▁ 1 9 8 4 . ▁ ▁Design ▁The ▁Second ▁Street ▁Bridge ▁has ▁a ▁single - span ▁Wh ipp le ▁tr uss ▁design , ▁made ▁of ▁steel ▁and ▁iron . ▁The ▁bridge ▁is ▁ ▁wide ▁and ▁sp ans ▁ ▁over ▁the ▁Kal am az oo ▁River ▁with ▁ ▁of ▁water ▁clear ance . ▁Its ▁ab ut ments ▁are ▁made ▁of ▁gran ite ▁field stone . ▁The ▁structure ▁is ▁decor ated ▁with ▁lattice ▁work , ▁iron ▁end ▁post ▁fin ial s , ▁and ▁l att iced ▁metal ▁hand rails . ▁On ▁one ▁side ▁of ▁the ▁bridge ▁is ▁a ▁ped est rian ▁walk way ▁with ▁wood ▁flo oring . ▁ ▁See ▁also ▁ ▁List ▁of ▁brid ges ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁Michigan ▁National ▁Register ▁of ▁Historic ▁Places ▁list ings ▁in ▁Al leg an ▁County , ▁Michigan ▁List ▁of ▁Michigan ▁State ▁Historic ▁S ites ▁in ▁Al leg an ▁County , ▁Michigan ▁ ▁References ▁ ▁External ▁links ▁ ▁Category : Ro ad ▁brid ges ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁Michigan ▁Category : Mich igan ▁State ▁Historic ▁S ites ▁Category : Transport ation ▁in ▁Al leg an ▁County , ▁Michigan ▁Category : Build ings ▁and ▁structures ▁in ▁Al leg an ▁County