Rock Valley Bridge, Spanning North Timber Creek at Old U.S. Highway 30, Marshalltown vicinity, Marshall County, IA

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Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey

12 b&w photos
28 data pages
1 photo caption pages

TITLE:
Rock Valley Bridge, Spanning North Timber Creek at Old U.S. Highway 30, Marshalltown vicinity, Marshall County, IA

CALL NUMBER:
HAER IOWA,64-MARS.V,1-

REPRODUCTION NUMBER:
[See Call Number]

MEDIUM:
Photo(s): 12 (4 x 5 in.)
Data Page(s): 27 plus cover page
Photo Caption Page(s): 1

DATE:
Documentation compiled after 1968.

CREATOR:
Historic American Engineering Record, creator

NOTE:
Survey number HAER IA-29

Building/structure dates: 1918 initial construction

Significance: The Rock Valley Bridge represents the culmination of an extensive concrete bridge construction program undertaken by Marshall County in the 1910s. It is the only span built by the county on the Lincoln Highway, America's first transcontinental route. This medium-span, reinforced concrete rainbow arch is a representative example of the hundreds of such structures designed and marketed by their inventor, Des Moines engineer James B. Marsh. Dozens of rainbow arches were built in Iowa in the 1910s, 20s, and 30s. Now only eleven remain, most in deteriorating condition.

SUBJECTS:
IOWA--Marshall County--Marshalltown vicinity

COLLECTION:
Historic American Engineering Record (Library of Congress)

REPOSITORY:
Library of Congress, Prints and Photograph Division, Washington, D.C. 20540 USA

DIGID:
http://hdl.loc.gov/loc.pnp/hhh.ia0191

CONTENTS:
Photograph caption(s):
1. OVERALL VIEW OF BRIDGE AND LINCOLN HIGHWAY, SHOWING NORTH APPROACH TO BRIDGE. VIEW TO SOUTH.
2. OVERALL VIEW OF BRIDGE AND LINCOLN HIGHWAY, SHOWING SOUTH APPROACH TO BRIDGE. VIEW TO NORTH.
3. OVERALL VIEW OF BRIDGE AND NORTH TIMBER CREEK. VIEW TO SOUTHWEST.
4. WEST WEB OF BRIDGE AND PORTION OF NORTH APPROACH GUARDRAIL, FROM STREAMBANK. VIEW TO SOUTHWEST.
5. WEST WEB OF BRIDGE, FROM STREAMBANK. VIEW TO SOUTHWEST.
6. WEST WEB OF BRIDGE, FROM STREAMBANK. VIEW TO SOUTHWEST.
7. BRIDGE ARCHES AND DECK, FROM ROADWAY. VIEW TO NORTH.
8. EAST ARCH, FROM ROADWAY. VIEW TO NORTH.
9. DETAIL OF EAST ARCH, FROM ROADWAY, SHOWING ARCH RIB, ARTICULATED HANGER AND GUARDRAIL. VIEW TO SOUTHEAST.
10. DETAIL OF WEST ARCH, FROM ROADWAY, SHOWING ARCH RIB, HANGERS AND GUARDRAIL. VIEW TO SOUTH.
11. DETAIL OF WEST WEB, FROM STREAMBANK, SHOWING ARCH RIB, HANGERS, FLOOR BEAMS AND GUARDRAIL. VIEW TO NORTHEAST.
12. DETAIL OF NORTH ABUTMENT, FROM BENEATH, SHOWING ARCH RIB AND FLOOR BEAM. VIEW TO NORTHEAST.

CONTROL #:
IA0191

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