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Portland

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Union Avenue Viaduct, Spanning between Southeast Harrison & Southeast Iv, Portland, Multnomah County, OR



Data Pages


Photo Caption Pages


Item Title


Location
Spanning between Southeast Harrison & Southeast Iv, Portland, OR

Find maps of Portland, OR


Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER OR-132
Building/structure dates: 1936 initial construction
Significance: Completed in 1937, the Union Avenue Viaduct is the longest continuous concrete slab/beam/girder-type structure in the state of Oregon. The original structure was built in 1936-37 and refined with a subordinate couplet addition finished in 1965. The original portion of the viaduct, 1,639 feet long, 60'-6" wide and 881 linear feet of filled roadway approaches between concrete retaining walls, is essentially intact and dominates the smaller and less classically detailed 1,008-foot Grand Avenue couplet. Original luminaries, stairwells and railings remain on the 1937 structure, as does the sidewalk on the west exposure. A prominent decorative feature of the viaduct is its precast concrete Tudor drop arch railing. The viaduct effectively facilitated traffic along Union Avenue, the longest north-south connector in the city of Portland. Motorists experienced substantially improved access to and from the city's Willamette River bridges and the Interstate Bridge on the Columbia. Beyond Portland the structure at one proved an indispensable link in the newly designated eastside Highway 99E connection between Portland and its suburbs. Constructed in the vicinity of an existing railroad and streetcar transportation corridor, the viaduct provided an efficient connection between the commercial area of Union Avenue to the north and the semi-industrial area to the south by eliminating at-grade crossings.

Subjects
Vehicular Bridges


Related Names
Hoffman Construction Company


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
Topographic view of East Portland, with Marquam Bridge crossing the Willamette River and downtown Portland to the left of view. The Union Avenue Viaduct is at the far right and middle of frame
Topographic view of the industrial district of East Portland and the Union Avenue Viaduct, view looking north from the Ross Island Bridge
Topographic view of the viaduct, view looking north from the Ross Island Bridge. The viaduct is center frame, within the industrial district of southeast Portland
General perspective view of the viaduct, view looking north
General perspective view of the Union Avenue Viaduct, view looking down on the deck of the Viaduct, from the approach span of the Ross Island Bridge, view looking north
General perspective view of the Union Avenue Viaduct, view looking northeast
General perspective view of the viaduct, view looking northeast
Perspective view of the deck and superstructure, view looking south from the north end of the viaduct
Perspective view of the viaduct, view looking south from the north end of the structure
Perspective view of the MLK Viaduct, view looking north, from the midsection of the viaduct
Perspective view of the viaduct, view looking southeast
Perspective view of the viaduct, view looking south
Substructure view of the viaduct, view looking south
Substructure view of the Union Avenue Viaduct, view looking southeast
Substructure view of the viaduct, view looking south, north end of structure
Substructure view of the viaduct, view looking east from north end of structure
Detail view of substructure, view looking south
Substructure view of the viaduct, view looking north from the centerline of structure
Detail view of the viaduct's pedestrian features, view looking south at the stairwell on the east side of the structure
Detail view of the stairwell on the west side of structure, view looking south
Detail view of the stairwell on the west side of structure, view looking southeast
Detail view of stairwell on west side of the structure, view looking east
Detail view of stairwell on the west side of the viaduct, north end of structure
Detail view of stairwells at the intersection of SE Harrison Street and the viaduct
Detail view of stairwell at SE Harrison Street
Detail elevation view of stairwell at SE Harrison Street, view looking west
Detail view of antique light fixture and decorative railing, view looking northeast at the south end of the viaduct
Detail view of lancet-arched, concrete pedestrian railing


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