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Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey
 16 b&w photos |  7 data pages |  2 photo caption pages |
How to obtain copies of this item
TITLE:
Mill Rock Bridge, Spanning Big Bear Creek, Monmouth Township, Jackson County, IA
CALL NUMBER:
HAER IOWA,49-MONMO,1-
REPRODUCTION NUMBER:
[See Call Number]
MEDIUM:
Photo(s): 16 (4 x 5 in.)
Data Page(s): 6 plus cover page
Photo Caption Page(s): 2
DATE:
Documentation compiled after 1968.
CREATOR:
Historic American Engineering Record, creator
RELATED NAME(S):
Clinton Bridge & Iron Works
NOTE:
Survey number HAER IA-7
Building/structure dates: 1913 initial construction
Significance: The Mill Rock Bridge was erected by Clinton Bridge & Iron Works, a major Iowa bridge contractor. It is locally significant as an early instance of the use of riveted connections and concrete deck in county bridge construction. These were among features which were to become standard in subsequent decades due to the establishment of the Iowa State Highway Commission and the Commission's enforcement of design standards for various kinds of crossings. Because the Mill Rock Bridge does not display all features associated with this standardization program, it may be considered an illustration of the transition from county to state control of local bridge design and construction.
SUBJECTS:
IOWA--Jackson County--Monmouth Township
OTHER TITLE:
Bear Creek Bridge
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.ia0116
CONTENTS:
Photograph caption(s):
1. DOWNSTREAM ELEVATION SHOWING RELATIONSHIP OF BRIDGE TO SURROUNDING FARMS, LOOKING SW
2. EAST APPROACH, LOOKING W
3. WEST APPROACH, LOOKING E
4. DOWNSTREAM ELEVATION, LOOKING S
5. UPSTREAM ELEVATION, LOOKING N
6. UPSTREAM 3/4 VIEW, LOOKING WNW
7. PORTAL VIEW THROUGH TRUSS SHOWING BUILDERS PLATE, LOOKING E
8. VIEW THROUGH TRUSS SNOWING CONCRETE DECK, LOOKING E
9. VIEW THROUGH TRUSS SHOWING UPPER CHORD, TOP LATERAL AND CROSS BRACING, LOOKING W
10. INCLINED END POST, UPPER CHORD CONNECTION POINT 1 (1L NEAR, 1R FAR) LOOKING N
11. UPPER CHORD CONNECTION PANEL POINT 2L, LOOKING N
12. UPPER CHORD CONNECTION PANEL POINT 3, LOOKING N
13. INCLINED END POST, LOWER CHORD CONNECTION AND ABUTMENT, LOOKING NW
14. LOWER CHORD AND CONNECTIONS AT PANEL POINT 2L AND 3 (1. co r.), LOOKING N
15. SOUTH ELEVATION SHOWING INCLINED END POST AND UPPER CHORD CONNECTION AT PANEL POINT 1R, LOWER CHORD AND INCLINED END POST CONNECTION, AND ABUTMENT, LOOKING ENE
16. UNDERSIDE OF CONCRETE DECK SHOWING FLOOR BEAMS, STRINGERS, AND CROSS BRACING, LOOKING W.
CONTROL #:
IA0116
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