The Northern Pacific route was completed in 1886 in order to fulfill the 1864 land grant signed by Abraham Lincoln. To meet the deadline shortcuts were taken that added unnecessary curvature but got the job done earlier. Now that the line was done engineers now had the luxury to build tunnels or bridges where needed to straighten out the alignment. Therefore in 1899 2 bridges and one tunnel were built to bypass the “shoofly”. In 1958 a new route, to accommodate the newly built Howard Hanson dam and reservoir, altogether bypassed the bridges and tunnel.