Ignore the false claims that the Oregon and Washington highway departments are making about the number of lanes on their proposed I-5 project:  its footprint will be 164 feet—easily enough for a 10- or 12-lane roadway.

This commentary was originally published at Bike Portland, and is re-published here with permission.

If you followed Tuesday’s Portland City Council work session or have been reading press reports about the Interstate Bridge Replacement project, you’ve probably noticed claims that the size of the project has somehow been reduced to adding “just one auxiliary lane” in each direction to I-5. The implication is that they’re only building enough capacity to expand the existing I-5 bridge from its current six lanes (three in each direction) to eight lanes (three plus a so-called “auxiliary” lane in each direction).

This claim is false.

A close look at the materials prepared by the Oregon and Washington departments of transportation shows they plan
to build a new I-5 bridge at least 164 feet wide — easily enough for ten or even twelve traffic lanes.

A close look at the materials prepared by the Oregon and Washington departments of transportation shows they plan to build a new I-5 bridge at least 164 feet wide — easily enough for ten or even twelve traffic lanes. While the glossy materials describing the project prominently talk about “one auxiliary lane” (in each direction), they almost completely omit a description of the actual width of the bridge. The IBR documents show only crude and misleading cartoon-like drawings of the bridge, without any actual measurements. That’s intentional: because they don’t really want you to know how wide a structure they’re planning.

But in a cryptic note in their presentation, they do refer to the width: The so-called ten lane bridge (two auxiliary lanes each direction) is said to have the same “footprint” as the 2013 Locally Preferred Alternative (LPA, a step in the federal NEPA review process). For the record, that footprint is 180 feet. For the so-called eight lane bridge (one auxiliary lane in each direction), the footprint is described as “2013 LPA Minus 16 Feet” which works out to 164 feet wide.

The broader context is this: the so-called “bridge replacement” is really a five-mile long, ten or twelve lane wide highway widening project that will cost $5 billion, and potentially a lot more.

ODOT’s actual plans for a 180′ wide CRC obtained by public records request.

This is a repetition of the false claim made for the preceding project — the failed Columbia River Crossing (CRC). In 2010, in response to objections from the City of Portland and Metro, ODOT and WSDOT announced they were reducing the size of the CRC bridge from 12 lanes to 10 lanes. But in reality, all they did was change the references in the project documents to that number of lanes, while literally erasing from the Final Environmental Impact Statement every single reference to the actual widths of the bridges and other structures they intended to build. A public records request showed the actual plans for the bridges — which were not published — were exactly the same size (180 feet in width) as they were for the 12-lane version of the bridge.


The limited materials released by the IBR project to date make it clear that they are engaged in exactly the same deception.

With standard-width 12 foot wide freeway lanes, this 164 foot wide bridge would accommodate ten traffic lanes (120 feet), with 11 foot shoulders on either side of the travel lanes, or as many as twelve travel lanes (144 feet) with five foot shoulders on either side of the twelve travel lanes). (Alternatively, the 164 foot width would allow construction of 12 travel lanes with 2 foot wide left shoulders and 8 foot wide right shoulders, which would be common, if not generous for an urban bridge.)

While they’re calling it an eight-lane bridge, it’s really a 10 or 12 lane bridge.

ODOT and WSDOT will no doubt say they’re “only” adding two lanes, and point to the supposed safety benefits of wider shoulders; but nothing prevents them, after building a 164-foot wide bridge, from coming back with a paint truck and re-striping it for ten or twelve lanes. In fact, they’ll claim that they can do that without any further environmental analysis under a “categorical exclusion” to the US DOT claims to the National Environmental Policy Act.

This isn’t an aberration or an accident, it’s an intentional strategy to evade environmental review: ODOT and WSDOT did this a decade ago on the failed Columbia River Crossing. It did the same thing with the I-5 Rose Quarter project, again claiming it was merely adding one auxiliary lane in each direction. Meanwhile its actual plans (which it kept secret and didn’t include in the Environmental Assessment) showed it planned to build the I-5 Rose Quarter project to be 160 feet wide, easily enough to accomodate 10 lanes of traffic.

The highway builders know — though they refuse to admit — that more lanes induce more traffic and more pollution. That’s why they’re engaging in this highly deceptive process of claiming they’re just adding a single “auxiliary” lane, when in fact, they’re engineering structures that can be repainted in a day to be vastly wider. This subterfuge enables them to claim minimal environmental impacts now, and then with no further review, create exactly the wider roadway they wanted all along.