The Washington tunnel is possibly the most usable one of the bunch - it could potentially host a future light-rail line, and thus be protected from disruptions on the rare day when the bridges open. (Not much use as a busway without any ventilation, unless CTA switches to electric buses.) Unfortunately it's full of utility lines, so those would need to be relocated to God-only-knows-where. The tunnel still has a cobbled floor with the old rail tracks set in it.
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Originally Posted by left of center
There are tunnels under Van Buren and LaSalle too, and they were all used for street cars back in the day IIRC. The LaSalle and Washington tunnels were older through, and were used for horse drawn carriages and pedestrians before the advent of the streetcar.
The LaSalle St tunnel was filled in and blocked off by the blue line under Lake St, but I believe that the Washington and Van Buren tunnels still remain, with their entrances sealed up. Would be neat if they could find a use for them again.
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History lesson, kids...
The Van Buren one doesn't actually run under Van Buren, it runs about 120' north below private property. It, too, was blocked off when 311 S Wacker was built. The developers imagined using it as a pedway to Union Station. The connection was even included on the construction drawings for the building, but for some reason it was never built. That was part of the rationale for the winter garden, to provide a dignified place for people to descend. There would have been a second set of (long) escalators leading down from the lower level of the winter garden to the tunnel.
Amtrak's current Union Station proposal includes a development on the Union Station garage, which is the site of the other tunnel portal. Maybe if that ever gets off the ground we can see something happen with the tunnel. I don't think it makes much sense as a pedway, there's no retail to draw people down there and the river bridges are rarely opened like they were when the tunnel was built. Nowadays, 99% of the time it would be more convenient just to stay at street level. It would be just as sucky as the CTA transfer tunnel at Jackson, only 3 times longer.
The sidewalks around there do get very congested during rush periods, which is why the Central Area Plan called for a new pedestrian bridge at Quincy. It would probably cost a similar amount as retrofitting the tunnel, but would be more convenient and architecturally splashy.