James,
I think this might be your Joliet Bridge. It's abandoned on the side of the road at 418 E Front on the property of Charles Ringer Studio / Gallery. He gas a lot of derelict stuff there.
Picture taken 7-2-13 My GPS N45 29.251 W108 57.876
Webmaster's note: The photo that was here has been incorporated into the main site.
That's the same bridge, as far as I can tell.