able ▁that ▁far ▁north . ▁ ▁A ▁k eros ene ▁engine ▁in ▁the ▁lift ▁house ▁could ▁raise ▁it ▁ 4 3 ▁feet ▁in ▁about ▁thirty ▁minutes . ▁ ▁In ▁theory , ▁the ▁mov able ▁span ▁might ▁also ▁be ▁lifted ▁by ▁a ▁hand - turn ed ▁cap stan . ▁ ▁The ▁span ▁was ▁last ▁raised ▁in ▁ 1 9 3 5 ▁and ▁the ▁lift ▁mach in ery ▁was ▁removed ▁in ▁ 1 9 4 3 . ▁ ▁In ▁ 1 9 2 5 ▁a ▁pl ank ▁road bed ▁was ▁built ▁for ▁one - way ▁veh icular ▁and ▁foot ▁traffic , ▁while ▁the ▁bridge ▁continued ▁to ▁be ▁used ▁by ▁the ▁Great ▁Northern ▁Rail road . ▁ ▁Although ▁a ▁long ▁bridge ▁with ▁one - way ▁traffic ▁and ▁shared ▁with ▁rail road ▁trains ▁should ▁have ▁been ▁spect ac ular ly ▁ha z ard ous , ▁a ▁ 1 9 8 1 ▁study ▁found ▁that ▁it ▁was ▁" so ▁dangerous ▁that ▁it ▁[ was ] ▁safe " ▁because ▁drivers ▁were ▁extra ordin arily ▁c aut ious ▁when ▁crossing ▁it . ▁ ▁In ▁ 1 9 7 7 , ▁when ▁the ▁Bur ling ton ▁Northern ▁moved ▁to ▁exclude ▁motor ▁vehicles ▁from ▁the ▁bridge , ▁funds ▁for ▁a ▁modern ▁road ▁bridge ▁were ▁appropri ated . ▁Snow den ▁Bridge ▁remained ▁us able ▁for ▁veh icular ▁traffic ▁until ▁ 1 9 8 5 , ▁when ▁the ▁Mon D ak ▁Bridge ▁was ▁completed ▁nearby ▁in ▁North ▁Dak ota . ▁ ▁Notes ▁ ▁References ▁ ▁Deb bie ▁Cross land , ▁“ S now den