Historic Photographs

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Rock Island

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Rock Island Arsenal, Rock Island Bridge, Fort Armstrong Avenue, Rock Island, Rock Island County, IL



B&W Photos

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Data Pages


Photo Caption Pages


Item Title


Location
Fort Armstrong Avenue, Rock Island, IL

Find maps of Rock Island, IL


Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER IL-20-P
Building/structure dates: 1896 initial construction
Building/structure dates: 1908 subsequent work
Building/structure dates: 1909 subsequent work
Building/structure dates: 1923 subsequent work
Building/structure dates: 1933 subsequent work
Building/structure dates: 1957 subsequent work
National Register Number: 69000057
Significance: The Rock Island Bridge was constructed in 1895-1896 to connect the arsenal with Davenport, Iowa. It was the first major bridge commission of Chicago engineer Ralph Modjeski, who subsequently established a reputation as one of the country's leading bridge designers. The bridge was equipped with a variety of innovative safety features, including pneumatic rail locks, which did not become widely used until two decades later. Part of the Rock Island Arsenal National Register Historic District, the Rock Island Bridge is the oldest surviving Mississippi railroad crossing in the Iowa-Illinois region.

Subjects
Armies
Railroad Bridges
Railroad Industry


Related Names
Modjeski, Ralph


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
1. 3/4 overall view from the Clock Tower Building (Building 205); looking NNW toward Davenport, Iowa. (Ceronie)
2. 3/4 overall view from the Iowa (N) side; looking SSW. (Ceronie)
3. Vehicular approach as seen from the Iowa (N) side; looking SE. (Harms)
4. Railroad deck approach as seen from the Iowa (N) side; looking S. (Harms)
5. Vehicular approach as seen from the Illinois (S) side; looking N. (Harms)
6. W elevation of Pratt railroad approach span (Span A), Iowa (N) side, looking NE. (Harms)
7. 3/4 view of Pratt truss (Span D); looking NW. (Harms)
8. Elevation of swing span (Span G); looking W. (Ceronie)
9. Detail view of central panel and control room, swing span (Span G); looking W. (Ceronie)
10. General view of the railroad deck, Pratt truss (Span F); looking NNW. (Harms)
11. General view of the vehicular deck, swing span (Span G); looking NNW. (Ceronie)
12. Detail view of concrete pier and the S end of Span F; looking SW. (Ceronie)
13. General view of the stringer system, swing span (Span G), showing also the floor beams and anti-sway bracing; looking NNW. (Harms)
14. S end view of Span F from open swing span (Span G); looking NNW. (Ceronie)
15. Detail view of the lifting jacks for the swing span (Span G), Illinois (S) side; looking SW. (Ceronie)
16. Overall view of the swing span (Span G) turning drum, showing rollers and drive chains; looking W. (Ceronie)
17. Detail view of swing span (Span G) drive chain and rollers, looking W. (Ceronie)
18. Interior view of control room, showing control panel and gears; looking SE. (Harms)
19. Interior view of control room, showing turning gears; looking NW. (Harms)
20. Top chord, pin-connected bottom chord & top lateral bracing; Pratt truss, Iowa side (Span A, railroad approach span); looking E. (Ceronie)
21. Top & bottom chord, top lateral bracing, and inclined end post; Pratt truss (Span B); looking E. (Ceronie)
22. Bottom chord and inclined end post, swing span (Span G); looking W. (Ceronie)
23. Top chord and lateral bracing, swing span (Span G); looking W. (Ceronie)
24. Middle pin connection at L4, showing also panels 1, 2, & 3; Swing Span (Span G); looking NE toward Davenport, Iowa. (Ceronie)
25. View from railroad deck, showing middle pin connection at R6 and the positioning of the control room on the swing span (Span G); looking NE toward Davenport, Iowa. (Ceronie)
26. Photograph of a photograph in possession of Rock Island Arsenal Historical Office. SERIES OF VIEWS BEFORE CONSTRUCTION OF LOCK AND DAM, SHOWING RAIL BED ON UPPER DECK (UPPER LEFT), SWING SPAN IN ROTATION (UPPER RIGHT), EAST ELEVATION OF SWING SPAN AND BALTIMORE TRUSSES (CENTER), VEHICULAR ROADWAY ON LOWER DECK (LOWER LEFT), AND DRAW PIER. ORIGINALLY PUBLISHED 1898.


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