Historic Photographs

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Iowa

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Monmouth Township

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Mill Rock Bridge, Spanning Big Bear Creek, Monmouth Township, Jackson County, IA



B&W Photos

HB409308
Downstream Elevation Showing Relationship Of Bridge To Surrounding Farms, Looking Sw

HB409309
East Approach, Looking W

HB409310
West Approach, Looking E

HB409311
Downstream Elevation, Looking S

HB409312
Upstream Elevation, Looking N

HB409313
Upstream 3/4 View, Looking Wnw

HB409314
Portal View Through Truss Showing Builders Plate, Looking E

HB409315
View Through Truss Snowing Concrete Deck, Looking E

HB409316
View Through Truss Showing Upper Chord, Top Lateral And Cross Bracing, Looking W

HB409317
Inclined End Post, Upper Chord Connection Point 1 (1l Near, 1r Far) Looking N

HB409318
Upper Chord Connection Panel Point 2l, Looking N

HB409319
Upper Chord Connection Panel Point 3, Looking N

HB409320
Inclined End Post, Lower Chord Connection And Abutment, Looking Nw

HB409321
Lower Chord And Connections At Panel Point 2l And 3 (1

HB409322
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

HB409323
Underside Of Concrete Deck Showing Floor Beams, Stringers, And Cross Bracing, Looking W.


Data Pages


Photo Caption Pages


Item Title


Location
Spanning Big Bear Creek, Monmouth Township, IA

Find maps of Monmouth Township, IA


Created/Published
Documentation compiled after 1968.

Notes
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.

Related Names
Clinton Bridge & Iron Works


Collection
Historic American Engineering Record (Library of Congress)

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.


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