▁at ▁the ▁current ▁location ▁was ▁first ▁constructed ▁in ▁ 1 7 7 4 ▁by ▁S ylvan us ▁Town send . ▁The ▁mill ▁was ▁dis m ant led ▁in ▁ 1 9 1 5 , ▁and ▁parts ▁of ▁it ▁were ▁used ▁to ▁construct ▁the ▁nearby ▁William ▁K iss am ▁V ander b ilt ▁II ▁estate , ▁which ▁is ▁now ▁the ▁V ander b ilt ▁Museum . ▁The ▁current ▁Mill ▁Dam ▁Bridge ▁prest ress ed ▁concrete ▁center ▁span ▁and ▁t ide g ates ▁built ▁in ▁ 2 0 0 5 ▁replaced ▁the ▁span ▁from ▁ 1 9 3 6 . ▁The ▁replacement ▁project ▁won ▁the ▁ 2 0 0 5 ▁American ▁Council ▁of ▁Engineering ▁Comp an ies ▁( AC EC ) ▁Long ▁Island ▁Project ▁of ▁the ▁Year ▁Award . ▁ ▁The ▁bridge ▁was ▁closed ▁to ▁traffic ▁in ▁October ▁ 2 0 0 7 , ▁due ▁to ▁d eter ior ation ▁of ▁the ▁old ▁cause way ▁connecting ▁the ▁new ▁span ▁to ▁the ▁shore . ▁In ▁February ▁ 2 0 0 8 , ▁workers ▁making ▁rep airs ▁to ▁the ▁cause way ▁un ear th ed ▁a ▁ 3 0 0 0 ▁p ound ▁( 1 4 0 0 ▁kil ogram ) ▁g ear , ▁believed ▁to ▁have ▁been ▁installed ▁at ▁the ▁t ide ▁mill ▁during ▁an ▁ 1 8 4 8 ▁over ha ul . ▁ ▁It ▁re open ed ▁to ▁traffic ▁on ▁June ▁ 2 7 , ▁ 2 0 0 8 . ▁ ▁Gr ist ▁Mill ▁Park ▁ ▁In ▁ 2 0 0 1 ,