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Sixth Street Viaduct, Spanning Burlington Northern Railroad & Valley Str, Burlington, Des Moines County, IA



B&W Photos


Data Pages


Photo Caption Pages


Item Title


Location
Spanning Burlington Northern Railroad & Valley Str, Burlington, IA

Find maps of Burlington, IA


Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER IA-36
Building/structure dates: 1886 initial construction
Building/structure dates: 1903 subsequent work
Significance: The Sixth Street Viaduct is actually comprised of two separate structures: a pin-connected Pratt truss built over the tracks of the Chicago, Burlington and Quincy Railroad in 1886 and a girder overpass that was built as an approach in 1903-04. Both bridges are technologically significant as rare survivors of their type. The 1886 span is one of only three pinned through trusses remaining in Iowa's urban areas. Similarly, the open-web design of the 1903 girders is the only example of this uncommon configuration known to remain in the state. The viaduct as a whole is historically significant for its role in the development of downtown Burlington and its representation of the sometimes uneasy relationship between the city and the railroad that supported it.

Subjects
Vehicular Bridges


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
1. OVERALL VIEW OF VIADUCT, WITH JEFFERSON STREET IN FOREGROUND, LOOKING SOUTH ALONG SIXTH STREET
2. OVERALL VIEW OF VIADUCT, WITH NORTH APPROACH GRADE IN FOREGROUND, 1903 GIRDERS IN MIDDLE GROUND AND 1886 TRUSS IN BACKGROUND, LOOKING SOUTH ALONG SIXTH STREET
3. OVERALL VIEW OF VIADUCT, WITH NORTH APPROACH GRADE IN LEFT FOREGROUND AND 1903 GIRDERS AND 1886 TRUSS IN RIGHT BACKGROUND, LOOKING SOUTHEAST
4. OVERALL VIEW OF 1903 GIRDERS AND NORTH APPROACH GRADE, LOOKING NORTHEAST FROM VALLEY STREET RAMP
5. OVERALL VIEW OF 1886 TRUSS AND GIRDERS FROM MARKET STREET, LOOKING NORTHWEST
6. OVERALL VIEW OF 1886 TRUSS AND GIRDERS, LOOKING SOUTHEAST FROM VALLEY STREET RAMP
7. VIEW OF WEST WEB AND NORTH PORTAL OF 1886 TRUSS FROM VALLEY STREET RAMP, LOOKING SOUTHEAST
8. VIEW OF WEST WEB OF 1886 TRUSS, LOOKING EAST FROM BURLINGTON NORTHERN RAILROAD TRACKS
9. VIEW OF SOUTH PORTAL OF 1886 TRUSS, LOOKING NORTH ALONG SIXTH STREET
10. OVERALL VIEW OF 1886 TRUSS AND GIRDERS, LOOKING NORTHWEST FROM MARKET STREET
11. VIEW OF EAST WEB AND SOUTH PORTAL OF 1886 TRUSS, LOOKING NORTHWEST FROM MARKET STREET
12. VIEW OF DECK OF 1886 TRUSS, SHOWING ROADWAY, SIDEWALKS AND WEB MEMBERS, LOOKING SOUTH
13. DETAIL VIEW OF DECK OF 1886 TRUSS, SHOWING HIP VERTICAL, SIDEWALK AND GUARDRAIL, LOOKING EAST
14. DETAIL VIEW OF DECK OF 1886 TRUSS, SHOWING TYPICAL VERTICAL AND DIAGONALS, SIDEWALK AND GUARDRAIL, LOOKING EAST
15. DETAIL VIEW OF UPPER CHORD ON 1886 TRUSS, SHOWING ENDPOST, PORTAL STRUT, LATERAL BRACING, HIP VERTICAL AND DIAGONAL, LOOKING NORTHEAST
16. DETAIL VIEW OF UPPER CHORD ON 1886 TRUSS, SHOWING TYPICAL VERTICAL, STRUT, LATERAL BRACING AND DIAGONAL, LOOKING SOUTHEAST
17. DETAIL VIEW OF LOWER CHORD OF 1886 TRUSS, SHOWING FLOOR BEAM (WITH CANTILEVERED SIDEWALK EXTENSION), STRINGERS AND LATERAL BRACING, LOOKING NORTHEAST
18. UNDERSIDE VIEW OF 1886 TRUSS AND NORTH APPROACH GIRDER, LOOKING SOUTHEAST
19. VIEW OF NORTH ABUTMENT AND APPROACH GIRDER ON 1886 TRUSS, LOOKING NORTHEAST
20. DETAIL VIEW OF NORTH PIER AND APPROACH GIRDER ON 1886 TRUSS, LOOKING EAST
21. VIEW OF SOUTH ABUTMENT AND APPROACH GIRDER ON 1886 TRUSS, LOOKING SOUTHEAST
22. VIEW OF NORTH PORTAL OF 1903 GIRDERS, LOOKING SOUTH ALONG SIXTH STREET
23. VIEW OF EAST WEB OF 1903 GIRDERS, LOOKING WEST
24. VIEW OF WEST WEB OF 1903 GIRDERS, LOOKING EAST
25. UNDERSIDE VIEW OF 1903 GIRDERS, LOOKING SOUTHWEST
26. DETAIL VIEW OF 1903 GIRDERS ON PIERS, SHOWING PIER PEDESTAL AND CAP, CANTILEVERED SIDEWALK AND GIRDER WEBS, LOOKING EAST
27. DETAIL VIEW OF LOWER CHORD OF 1903 GIRDERS, SHOWING PIER CAP, CANTILEVERED SIDEWALK BRACKETS, FLOOR BEAMS, LATERAL BRACING AND UNDERSIDE OF CORRUGATED STEEL DECK. LOOKING SOUTHEAST
28. DETAIL VIEW OF UPPER CHORD OF 1903 GIRDER, LOOKING SOUTHWEST


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