6 images. Colorado Freeway Bridge, 12 February 1952. Concrete for first of 10 giant arches supporting new Colorado Freeway Bridge, to be poured this week.; Caption slip reads: "Photographer: Date: 1952-02-12. Reporter: Swaim. Assignment: New Colorado Bridge. K13, 14: Four construction workers riding 'hook' 100 feet above ground to top of form work for giant arch of new Colorado Street bridge. Crane with 160 foot boom is carrying men. Old bridge is in background. K16: New bridge work as seen from east end of old bridge. K15: New work from east end. K17: From under arch, looking west, showing nearly completed form work of arch. K18: Crane lifting form timbers to top of arch".