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There is a bike slot on the stairs that makes it not particularly onerous to walk a normal bike down (ie, no trailer etc). I know there have been ADA challenges and they've worked up proposals to replace the stairs, but I don't know that it's at the point of actionable plans. Here's the most recent thing I found with a quick google
https://bikeportland.org/2021/01/05/odo ... ath-324465
What is a "bike slot"? I've never heard of such a thing. Is it like a narrow ramp that you guide your bike down while you walk down the stairs, or something else? I don't think we have those kind of things in the Vancouver area, at least not that I've ever seen. Usually if there's a stairway in a public area (like a park or a campus) there's a full-width ramp adjacent or somewhere nearby. Closest thing I could find on a Web search is this, from Florida:
https://www.arcgis.com/sharing/rest/con ... utput=html, which doesn't really sound like something you'd find in the Gorge.
Obviously they're not going to bore out the tunnel to add a bike lane to an interstate, especially when there's a designated bike route that goes literally right over the top.
They'd have to narrow the traffic lanes slightly to increase shoulder-channel bandwidth since boring out the tunnel obviously isn't an option, neither is removing the footing on the right shoulder. But I don't think narrowbanding is doable either under federal highway standards, they're already kind of at their safe limit as it is, but who knows.