Historic Photographs

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Massachusetts

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Somerville

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Mystic River Drawbridge No. 7, Spanning Mystic River at Boston & Maine Railroad E, Somerville, Middlesex County, MA



B&W Photos

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Data Pages


Photo Caption Pages


Item Title


Location
Spanning Mystic River at Boston & Maine Railroad E, Somerville, MA

Find maps of Somerville, MA


Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER MA-88
Building/structure dates: 1894 initial construction
Building/structure dates: 1933 subsequent work
Building/structure dates: 1955 subsequent work
Building/structure dates: 1917 subsequent work
Part of building/structure is in Everett, Middlesex County, MA.
Significance: Drawbridge No. 7 is apparently the last horizontally folding railroad bridge in the eastern United States. Its technology is representative of the earliest patented movable span bridge in the country (patented by Joseph Ross of Ipswich, Massachusetts, in 1849). The horizontally folding draw was a common railroad bridge type in the Greater Boston area since the 1840s. All except Drawbridge No. 7 have been removed and/or replaced.

Subjects
Railroad Bridges


Related Names
Ross, John


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
1. OBLIQUE VIEW OF NORTHWEST SIDE OF MYSTIC RIVER BRIDGE, LOOKING SOUTHEAST FROM NEW (U/C) RAILROAD BRIDGE DECK
2. VIEW OF SOUTH ELEVATION OF BRIDGE, LOOKING NORTH
3. VIEW OF NORTH ELEVATION OF BRIDGE, LOOKING SOUTH FROM TRACK BED
4. OBLIQUE VIEW OF EAST SIDE OF BRIDGE, SHOWING TRAIN TRANSITING BOTH PORTALS, LOOKING WEST
5. OBLIQUE VIEW OF EAST SIDE OF BRIDGE, LOOKING WEST
6. VIEW OF BRACE STRUTS AND GUYS ON EAST SIDE OF BRIDGE, LOOKING WEST
7. DETAIL VIEW OF TOWER, NORTH ELEVATION, LOOKING SOUTH
8. DETAIL VIEW OF NEEDLE BEAM-GUY CONNECTION AND PIVOTS, LOOKING NORTHWEST
9. FRONTAL VIEW OF MOVABLE SPANS, RAISED AND SUSPENDED IN OPENING OPERATION
10. DETAIL VIEW OF NEEDLE BEAM-GUY CONNECTIONS, EAST ELEVATION, LOOKING SOUTHWEST
11. DETAIL VIEW OF TRUSS, 1917 SPAN, SOUTHWEST ELEVATION, LOOKING NORTHEAST
12. DETAIL VIEW OF WEST PIER AND 1917 TRUSS, LOOKING EAST
13. VIEW OF SWEEP ARM-DRIVE MECHANISM AND BELT CHAIN FROM MOOR, LOOKING EAST
14. DETAIL VIEW OF SWEEP ARM CONNECTION TO 1955 GIRDER, LOOKING NORTH
15. VIEW OF WINCH WITH HOISTING CHAIN ON FIRST LEVEL OF TOWER, LOOKING SOUTHWEST
16. VIEW OF LEVER CONNECTED TO CHAIN (BRIDGE IN CLOSED POSITION), LOOKING WEST
17. VIEW OF TOP CASTING WITH ARM AND SHACKLE CONNECTION, NORTHEAST CORNER OF TOWER, LOOKING SOUTHWEST
18. VIEW OF TYPICAL BEVEL PLATE, NORTH SIDE BETWEEN SECOND AND THIRD LEVELS OF TOWER, LOOKING NORTH
19. DETAIL VIEW OF LATERAL BRACING, NORTH ELEVATION, LOOKING NORTHWEST
20. VIEW OF OPERATING CONTROLS, NORTHWEST CORNER OF TENDERS SHANTY, LOOKING NORTHWEST
21. VIEW OF CONTROL PANEL ON EAST WALL OF SHANTY, LOOKING EAST
22. DETAILS OF PART OF TRUSS #1
23. DETAILS OF PART OF TRUSS #1
24. DETAILS OF PART OF TRUSS #2
25. DETAILS OF PART OF TRUSS #2
26. DETAILS OF NEEDLE BEAMS
27. ERECTION PLAN
28. DETAILS OF CASTINGS
29. ELEVATION OF TOWER
30. SUBSTRUCTURE - DRAW NO. 7
31. TRESTLE STRENGTHENING AND TRUSS BEARING SUPPORT
32. FENDER PIERS - DRAW NO. 7
33. TRESTLE APPROACHES
34. GENERAL PLAN & SECTIONS, SOUTHWEST FENDER PIER
35. STEEL & TIMBER DETAILS, SOUTHWEST FENDER PIER
36. TOWER STRENGTHENING


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