Portland-Milwaukie Light Rail Bridge Construction, June 2011 - TriMet
Portland-Milwaukie Light Rail Bridge Construction, June 2011 - TriMet
Portland-Milwaukie Light Rail Bridge Construction, June 2011 - TriMet
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River Depth• 77.52’ vertical clearance for 150’ section of main span• 65’ vertical clearance for entire span 128 years of daily water heights evaluated to select vertical clearance (1879-2007) Since last dam installation on the Willamette, Columbia, and tributaries, highest riverelevation was 28.5’ during1996 flood – ordinary high water elevation is 14.7’ Excluding 1996 flood, the highest river elevations recorded range from 16’ to 20’between November and <strong>June</strong>. Riverbed roughly 53’ below mean water elevation (avg.) at East Tower, 22’ at West6