(Amgen Helix, 420', 2004) across 11 RR tracks in Seattle, King County, WA. Mercer St. (curves NW & becomes Mercer Pl.) W. 1.7 miles from jct with I5 exit 167, merge NW onto Elliott Av. 0.15 miles to the bridge on the SW side of the road. (N47 37.682 W122 22.329) Photos by Bill Hopp 5-1-09.