Archive | Bridges

4-4-2 Columbia Crossing

Columbia River Crossing … a tunnel, a “Burnside Bridge” with MAX, and a freight arterial with added passenger rail capacity … Let’s call it the “4-4-2.”

Deliberations have begun on different options for a Columbia River Crossing. A tunnel under the Columbia River (including Oregon Slough/Portland Harbor) may offer a simple – even elegant, data based and cost effective solution to this transportation challenge – separating through trips from local ones. Then the fun begins…

The I-5 Task Force recommended 10 total lanes – freeway/auxiliary/arterial – and a pair of lightrail tracks between Oregon and Washington; data shows that at least 1/3, if not more, of all trips across the existing Interstate Bridges are of local origin with local destinations. “4-4-2” addresses the growing demand for local access across the Columbia River by creating a variety of options for those trips:

  • Four (4) through freeway lanes in a tunnel, going to six (6) lanes at Columbia Blvd. in Portland and Mill Plain Blvd. in Vancouver. (Columbia and Mill Plain are key E/W freight arterials)
  • Four (4) arterial lanes for local traffic on existing twin Interstate Bridges with dedicated light rail alignment in what are now the inside lanes.
  • Two (2) new arterial lanes designed for freight on upgraded railroad bridge – new lift and possible 3rd track for passenger rail.
  • Boulevard type arterial with traffic signals and/or circles for traffic distribution replaces existing freeway between River and Mill Plain; redevelop old freeway right-of-way between downtown Vancouver and Historic Reserve.
  • Boulevard type arterial with traffic signals and/or circles for traffic distribution replaces existing freeway from River to Denver Avenue/MLK and Marine Dr; redevelop vacated right-of-way and adjacent property between Columbia and bridgehead.
  • Upgrade & widen sidewalks on Interstate Bridges; add bike bridge in space between bridges supported by existing structures.

The Tunnel option simplifies construction logistics, has fewer impacts on river traffic, water quality, fish or air traffic. The conversion of the existing Interstate Bridges, retains historic structures, re-using them in new ways to accommodate local vehicle and transit trips. Removal/conversion of existing freeway segments captures valuable land adjacent to transit, arterials and the River for re-development…commercial, industrial or residental/retail.

The original Interstate Bridge, built in 1917, had four traffic lanes with streetcar tracks – you could take the Union Avenue streetcar to downtown Vancouver! With the construction of I-5 through North Portland and across the River, a second bridge was built and together the twin bridges became I-5 – the arterial and transit connections were lost!

“4-4-2” restores the arterial/rail connectivity between Portland and Vancouver.