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Bel Air vicinity

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Mitchell's Mill Bridge, Spanning Winter's Run on Carrs Mill Road, west of , Bel Air, Harford County, MD



B&W Photos

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Data Pages


Photo Caption Pages


Item Title


Location
west of, Bel Air vicinity, MD

Find maps of Bel Air, MD


Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER MD-79
Building/structure dates: 1885 initial construction
Significance: The Mitchell's Mill Bridge is a surviving example of the late 19th century wrought iron bridges once found throughout rural Maryland. The Pratt pony truss employed in the Mitchell's Mill span was widely used in the design of single-span bridges erected between 1870 and 1935. Due to increasing development in the rural areas of Maryland and the accompanying replacement of older highway bridges, relatively few of the 19th century Pratt truss bridges remain in northern Maryland.

Subjects
Wrought-iron Truss Bridges
Vehicular Bridges
Pony Truss Bridges


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
1. LOOKING DOWNSTREAM (NORTHEAST) ALONG WINTER'S RUN TOWARD THE MITCHELL'S MILL BRIDGE, SHOWING THE SETTING OF THE BRIDGE. CARRS MILL ROAD APPROACHES THE BRIDGE FROM THE SOUTH, ON THE RIGHT.
2. EAST ELEVATION OF BRIDGE SEEN FROM THE NORTHEAST, SHOWING APPROACH OF CARRS MILL ROAD FROM EAST.
3. CLOSER OBLIQUE VIEW OF EAST TRUSS OF BRIDGE, SEEN FROM THE NORTHEAST.
4. APPROACH OF CARRS MILL ROAD TO THE SOUTH PORTAL OF THE MITCHELLS MILL BRIDGE; VIEW TO NORTH.
5. VIEW ACROSS THE BRIDGE FROM ROADWAY TO THE NORTH.
6. OBLIQUE VIEW OF WEST TRUSS AND WEST SIDE OF SOUTH ABUTMENT; VIEW TO NORTHEAST.
7. CLOSER OBLIQUE VIEW OF WEST TRUSS AND WEST SIDE OF SOUTH ABUTMENT; VIEW TO NORTHEAST.
8. DETAIL OF NORTH END OF EAST TRUSS, SHOWING END POST, TOP AND LOWER CHORDS, AND DIAGONAL EYE BARS, SEEN FROM NORTHEAST.
9. DETAIL OF ONE OF THE TWO CENTER PANELS IN THE WEST TRUSS, SEEN FROM THE WEST, SHOWING POSTS, RIVETED PLATES, LOWER CHORDS, DIAGONAL EYE BARS WITH TURNBUCKLES, AND ENDS OF FLOOR BEAMS SUSPENDED FROM POSTS.
10. DETAIL OF RUBBLE MASONRY ABUTMENT ON THE SOUTH BANK AND DISINTEGRATING CONCRETE FACING; VIEW FROM WEST.
11. OBLIQUE VIEW OF EAST TRUSS AND EAST SIDE OF SOUTH ABUTMENT, SEEN FROM SOUTH BANK OF WINTER'S RUN.
12. DETAIL OF CONNECTION BETWEEN SOUTHEAST END POST AND TOP CHORD, SHOWING BOLT, RIVETED PLATES, AND EYE BAR; VIEW FROM WEST.
13. DETAIL OF CONNECTION BETWEEN TOP CHORD AND POST IN WEST TRUSS, SHOWING CHANNELS AND REINFORCED CAST-IRON LACING, I-BEAMS FASTENED TOGETHER WITH RIVETTED PLATES, AND ASSEMBLY OF DIAGONAL EYE BEAM AND BOLT; VIEW FROM EAST SIDE.
14. DETAIL OF CONNECTIONS AT THE BOTTOM OF A POST IN THE WEST TRUSS, SHOWING THE ASSEMBLY OF LOWER CHORD AND DIAGONAL EYE BOLTS AND THE SUSPENSION OF A FLOOR BEAM FROM THE POST BY A U-BOLT; VIEW FROM SOUTH BANK.
15. DETAIL OF UNDERSIDE OF BRIDGE, SHOWING LONGITUDINAL STRINGERS SUPPORTING WOODEN DECK AND RESTING ON TRANSVERSE FLOOR BEAMS. DIAGONAL EYE BARS FOR REINFORCEMENT ARE SEEN AT CENTER; VIEW FROM SOUTH BANK.


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