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Home > Iowa > Keokuk > Keokuk & Hamilton Bridge, Spanning Mississippi River, Keokuk, Lee County, IA



B&W Photos
General View From Upstream On The Iowa Shore, Looking S
HB409589
General View From Upstream On The Iowa Shore, Looking S
General View From Downstream On The Illinois Shore, Looking Nne
HB409590
General View From Downstream On The Illinois Shore, Looking Nne
General View From Upstream On The Illinois Shore, Looking Wsw
HB409591
General View From Upstream On The Illinois Shore, Looking Wsw
Three-quarter View From Downstream On The Iowa Shore, Looking E (swing Span Partially Open.) Photographer: Sarah J
HB409592
Three-quarter View From Downstream On The Iowa Shore, Looking E (swing Span Partially Open.) Photographer: Sarah J
Three-quarter View From Downstream On The Illinois Shore, Looking Nnw
HB409593
Three-quarter View From Downstream On The Illinois Shore, Looking Nnw
Keokuk Highway Approach And Tollbooth, Looking Ese
HB409594
Keokuk Highway Approach And Tollbooth, Looking Ese
Keokuk Highway Approach From Swing Span Fender, Looking Wnw
HB409595
Keokuk Highway Approach From Swing Span Fender, Looking Wnw
Tollbooth At Keokuk: Northwest Elevation
HB409596
Tollbooth At Keokuk: Northwest Elevation
Keokuk Highway Approach Trestle, Looking Ne
HB409597
Keokuk Highway Approach Trestle, Looking Ne
Keokuk Highway Approach Trestle
HB409598
Keokuk Highway Approach Trestle
Keokuk Railroad Approach
HB409599
Keokuk Railroad Approach
Keokuk Railroad Approach, Showing Original Stone Wall And Roadbed, Looking Nw
HB409600
Keokuk Railroad Approach, Showing Original Stone Wall And Roadbed, Looking Nw
Keokuk Approach Showing The Separation Of The Highway And Railroad Alignments
HB409601
Keokuk Approach Showing The Separation Of The Highway And Railroad Alignments
One Bent On The Keokuk Highway Approach Trestle
HB409602
One Bent On The Keokuk Highway Approach Trestle
General Deck View, Keokuk Highway Approach, Looking E Toward The Bridge
HB409603
General Deck View, Keokuk Highway Approach, Looking E Toward The Bridge
Swing Span: Upstream Elevation, Looking Ssw
HB409604
Swing Span: Upstream Elevation, Looking Ssw
Swing Span: Downstream Elevation, Looking Nne
HB409605
Swing Span: Downstream Elevation, Looking Nne
Swing Span: Three-quarter View From Downstream On Iowa Shore, Looking Ne
HB409606
Swing Span: Three-quarter View From Downstream On Iowa Shore, Looking Ne
Swing Span: Center Tower And Bridge Tender
HB409607
Swing Span: Center Tower And Bridge Tender's House
Swing Span: Railroad Deck
HB409608
Swing Span: Railroad Deck
Bridge Tender
HB409609
Bridge Tender's House From Railroad Deck, Looking Se
Interior Of Bridge Tender
HB409610
Interior Of Bridge Tender's House Showing Clutch And Brake Handles, Air Valve For Rail Locks, And Motor Controller For Turning Machinery, Looking N
Interior Of Bridge Tender
HB409611
Interior Of Bridge Tender's House Showing Indicators For Rail Locks And End Lift Machinery (right), Looking Ese
Reduction Gearing For Swing Machinery; Also Showing Drive Pinion, Rack And Rollers
HB409612
Reduction Gearing For Swing Machinery; Also Showing Drive Pinion, Rack And Rollers
Drum, Showing Lower Chord At Drum, Pinion Gear And Drive Shaft, Rack, And Rollers
HB409613
Drum, Showing Lower Chord At Drum, Pinion Gear And Drive Shaft, Rack, And Rollers
Drum, Showing Rollers And Rack
HB409614
Drum, Showing Rollers And Rack
Interior Of Drum, Overall View
HB409615
Interior Of Drum, Overall View
Interior Of Drum Showing Radial Stays For Drum And Wheel Frame
HB409616
Interior Of Drum Showing Radial Stays For Drum And Wheel Frame
Barrel Shot Of Swing Span In Open Position
HB409617
Barrel Shot Of Swing Span In Open Position
End Floor Beam And Lifting Jacks On Swing Span Looking Toward Center Tower
HB409618
End Floor Beam And Lifting Jacks On Swing Span Looking Toward Center Tower
End Floor Beam And Lifting Jacks On Swing Span, Looking Away From The Center Tower
HB409619
End Floor Beam And Lifting Jacks On Swing Span, Looking Away From The Center Tower
Swing Span: Highway Deck, Showing Automobile Barricades
HB409620
Swing Span: Highway Deck, Showing Automobile Barricades
Upper Connections At Swing Span Center Tower
HB409621
Upper Connections At Swing Span Center Tower
Top Chord Of Illinois Arm Of Swing Span
HB409622
Top Chord Of Illinois Arm Of Swing Span
Inside View Of The Top Chord-endpost Connection On The Swing Span
HB409623
Inside View Of The Top Chord-endpost Connection On The Swing Span
Swing Span: Bottom Chord Connection At 5l
HB409624
Swing Span: Bottom Chord Connection At 5l
Bottom Chord Connection At Center Tower And Drum
HB409625
Bottom Chord Connection At Center Tower And Drum
Swing Span: Bottom Chord Connection At 4l
HB409626
Swing Span: Bottom Chord Connection At 4l
Swing Span: Abutment And Endpost
HB409627
Swing Span: Abutment And Endpost
Swing Span: Lifting And Locking Jacks On Abutment
HB409628
Swing Span: Lifting And Locking Jacks On Abutment
Rail Locks On Swing Span
HB409629
Rail Locks On Swing Span
Upstream Elevation Of The Two Parker Spans, Looking Sse
HB409630
Upstream Elevation Of The Two Parker Spans, Looking Sse
Three-quarter View Of Parker Span From Downstream On Iowa Shore, Looking Ne
HB409631
Three-quarter View Of Parker Span From Downstream On Iowa Shore, Looking Ne
Pier 2 From Pier 1, Swing Span Open; Barrel Shot Of Parker Truss
HB409632
Pier 2 From Pier 1, Swing Span Open; Barrel Shot Of Parker Truss
Top Chord Of Parker Span From Walkway
HB409633
Top Chord Of Parker Span From Walkway
Parker Span: Top Chord Connection 4l
HB409634
Parker Span: Top Chord Connection 4l
Parker Span: Connection Between Endpost And Top Chord
HB409635
Parker Span: Connection Between Endpost And Top Chord
Highway Floorbeam Attachment To Verticals Of Parker Span
HB409636
Highway Floorbeam Attachment To Verticals Of Parker Span
Parker Span: Bottom Chord Connection 2l
HB409637
Parker Span: Bottom Chord Connection 2l
Parker Span: Bottom Chord Connection At 4l
HB409638
Parker Span: Bottom Chord Connection At 4l
Downstream Elevation Of Pratt Span, Looking Nne
HB409639
Downstream Elevation Of Pratt Span, Looking Nne
Three Quarter View Of Pratt Spans, Looking Nnw
HB409640
Three Quarter View Of Pratt Spans, Looking Nnw
Portal Of Pratt Span At Hamilton End
HB409641
Portal Of Pratt Span At Hamilton End
Deck Of Pratt Span, Looking Ese Toward Illinois Shore
HB409642
Deck Of Pratt Span, Looking Ese Toward Illinois Shore
Hamilton Abutment
HB409643
Hamilton Abutment
Pratt Span: Fixed Shoe On Hamilton Abutment
HB409644
Pratt Span: Fixed Shoe On Hamilton Abutment
Interior Of Pratt Span Showing Top Lateral Bracing, Top Chord, And Truss Panel, Looking Nw
HB409645
Interior Of Pratt Span Showing Top Lateral Bracing, Top Chord, And Truss Panel, Looking Nw
Pratt Span: Connection Between Top Chord And Inclined End Post
HB409646
Pratt Span: Connection Between Top Chord And Inclined End Post
Pratt Span: Top Chord Connection 2l
HB409647
Pratt Span: Top Chord Connection 2l
Pratt Span: Bottom Chord Connection 3r
HB409648
Pratt Span: Bottom Chord Connection 3r
Bottom Chord And Lateral Bracing Of Pratt Span And Pier 11
HB409649
Bottom Chord And Lateral Bracing Of Pratt Span And Pier 11
Pratt Span: Bottom Chord And Lateral Bracing
HB409650
Pratt Span: Bottom Chord And Lateral Bracing
Hamilton Railroad And Highway Approach
HB409651
Hamilton Railroad And Highway Approach
Illinois Highway Approach Looking E
HB409652
Illinois Highway Approach Looking E
Hamilton Approach Looking Toward Bridge, Showing Transfer Of The Highway Approach To The Bridge Structure
HB409653
Hamilton Approach Looking Toward Bridge, Showing Transfer Of The Highway Approach To The Bridge Structure
Truss Work At Roadway Curve On To Bridge, Looking Nw
HB409654
Truss Work At Roadway Curve On To Bridge, Looking Nw
Photocopy Of Postcard (original In The Possession Of The State Historical Society Of Iowa) Postmark 1906 Original (1869-71) Keokuk And Hamilton Bridge, From Northwest
HB409655
Photocopy Of Postcard (original In The Possession Of The State Historical Society Of Iowa) Postmark 1906 Original (1869-71) Keokuk And Hamilton Bridge, From Northwest
Photocopy Of Postcard (original In The Possession Of The State Historical Society Of Iowa) Western Mercantile Co., Keokuk, Iowa; Postmark 1911 Original (1869-71) Keokuk And Hamilton Bridge, From Wsw
HB409656
Photocopy Of Postcard (original In The Possession Of The State Historical Society Of Iowa) Western Mercantile Co., Keokuk, Iowa; Postmark 1911 Original (1869-71) Keokuk And Hamilton Bridge, From Wsw
Photocopy Of Photograph (original In The Possession Of The State Historical Society Of Iowa) Dated 5 July 1913 Original (1869-71) Keokuk And Hamilton Bridge, From N
HB409657
Photocopy Of Photograph (original In The Possession Of The State Historical Society Of Iowa) Dated 5 July 1913 Original (1869-71) Keokuk And Hamilton Bridge, From N
Photocopy Of Photograph (original In The Possession Of The State Historical Society Of Iowa) Anschutz, Photographer, C
HB409658
Photocopy Of Photograph (original In The Possession Of The State Historical Society Of Iowa) Anschutz, Photographer, C
Photocopy Of Postcard (original In The Possession Of The State Historical Society Of Iowa) L
HB409659
Photocopy Of Postcard (original In The Possession Of The State Historical Society Of Iowa) L
Photocopy Of Drawing, General Elevation And Plan, 1
HB409660
Photocopy Of Drawing, General Elevation And Plan, 1' = 80' (includes Entire Bridge)
Photocopy Of Drawing, Substructure, Piers 1 - 11 Inclusive, 3/16
HB409661
Photocopy Of Drawing, Substructure, Piers 1 - 11 Inclusive, 3/16' = 1'
Photocopy Of Drawing, Stress Sheet, Span 4, 1
HB409662
Photocopy Of Drawing, Stress Sheet, Span 4, 1' = 10' (pratt, 160' 5 1/4')
Photocopy Of Drawing, Stress Sheet, Span 7, 1
HB409663
Photocopy Of Drawing, Stress Sheet, Span 7, 1' = 10' (pratt, 146' 11 7/8')
Photocopy Of Drawing, Stress Sheet, Spans 8 - 11 Inclusive, 1
HB409664
Photocopy Of Drawing, Stress Sheet, Spans 8 - 11 Inclusive, 1' = 10' (pratts, 162' 8 3/8')
Photocopy Of Drawing, Spans 4 - 11, Trusses, 3/4
HB409665
Photocopy Of Drawing, Spans 4 - 11, Trusses, 3/4' = 1' (half Elevation, Severed)
Photocopy Of Drawing, Floor And Bracing, Spans 4 11 Inclusive, 3/4
HB409666
Photocopy Of Drawing, Floor And Bracing, Spans 4 11 Inclusive, 3/4' = 1'
Photocopy Of Drawing, End Bearings, Spans 4 11 Inclusive, 3/4
HB409667
Photocopy Of Drawing, End Bearings, Spans 4 11 Inclusive, 3/4' = 1'
Photocopy Of Drawing, Stress Sheet, Spans 2 And 3, 1
HB409668
Photocopy Of Drawing, Stress Sheet, Spans 2 And 3, 1' = 20' (parkers, 254' 5 1/4')
Photocopy Of Drawing, Spans 2 And 3, Trusses Lo - L2, 3/4
HB409669
Photocopy Of Drawing, Spans 2 And 3, Trusses Lo - L2, 3/4' = 1' (elevation, Severed)
Photocopy Of Drawing, Spans 2 And 3, Trusses L3 - L4, 3/4
HB409670
Photocopy Of Drawing, Spans 2 And 3, Trusses L3 - L4, 3/4' = 1' (elevation, Severed)
Photocopy Of Drawing, Spans 2 And 3, Floors And Bracing, 3/4
HB409671
Photocopy Of Drawing, Spans 2 And 3, Floors And Bracing, 3/4' = 1' (plan Views)
Photocopy Of Drawing, Spans 2 And 3, Laterals, 3/4
HB409672
Photocopy Of Drawing, Spans 2 And 3, Laterals, 3/4' = 1' (top And Bottom Lateral Bracing)
Photocopy Of Drawing, Spans 2 And 3, End Floor Beam And Bracing, 3/4
HB409673
Photocopy Of Drawing, Spans 2 And 3, End Floor Beam And Bracing, 3/4' = 1'
Photocopy Of Drawing, Spans 2 And 3, End Bearings, 1 1/2
HB409674
Photocopy Of Drawing, Spans 2 And 3, End Bearings, 1 1/2' = 1'
Photocopy Of Drawing, Span 1, Stress Sheet, 1
HB409675
Photocopy Of Drawing, Span 1, Stress Sheet, 1' = 15' (swing Span, 377' 1 1/2')
Photocopy Of Drawing, Span 1, Trusses Lo - L3 Inclusive, 3/4
HB409676
Photocopy Of Drawing, Span 1, Trusses Lo - L3 Inclusive, 3/4' = 1' (elevation, Severed)
Photocopy Of Drawing, Span 1, Trusses L4 - L6
HB409677
Photocopy Of Drawing, Span 1, Trusses L4 - L6' Inclusive, 3/4' = 1' (elevation, Severed)
Photocopy Of Drawing, Span 1, Center Support For Wires And Lamp, Various Scales
HB409678
Photocopy Of Drawing, Span 1, Center Support For Wires And Lamp, Various Scales
Photocopy Of Drawing, Span 1, Floors And Bracing, 3/4
HB409679
Photocopy Of Drawing, Span 1, Floors And Bracing, 3/4' = 1' (section And Plan)
Photocopy Of Drawing, Span 1, Bottom Laterals, 3/4
HB409680
Photocopy Of Drawing, Span 1, Bottom Laterals, 3/4' = 1'
Photocopy Of Drawing, Span 1, Details Of Drum, 3/4
HB409681
Photocopy Of Drawing, Span 1, Details Of Drum, 3/4' = 1' (elevation, Plan, And Section)
Photocopy Of Drawing, Span 1, Turntable, 3/4
HB409682
Photocopy Of Drawing, Span 1, Turntable, 3/4' = 1'
Photocopy Of Drawing, Span 1, Details Of Turntable Machinery, 3/4
HB409683
Photocopy Of Drawing, Span 1, Details Of Turntable Machinery, 3/4' And 1 1/2' = 1' (center Cone, Radial Strut Ring, Track, Rollers, Pinion Gears)
Photocopy Of Drawing, Span 1, Power Gearing, 3/4
HB409684
Photocopy Of Drawing, Span 1, Power Gearing, 3/4' = 1'
Photocopy Of Drawing, Span 1, End Lift Machinery, 3/4
HB409685
Photocopy Of Drawing, Span 1, End Lift Machinery, 3/4' = 1'
Photocopy Of Drawing, Span 1, General Arrangement Of Rail Lock And End Lift Machinery, 3/4
HB409686
Photocopy Of Drawing, Span 1, General Arrangement Of Rail Lock And End Lift Machinery, 3/4' = 1'
Photocopy Of Drawing, Span 1, Rail Latch, 3
HB409687
Photocopy Of Drawing, Span 1, Rail Latch, 3' And 6' = 1'
Photocopy Of Drawing, Sketches Showing Operation Of Automatic Shifter
HB409688
Photocopy Of Drawing, Sketches Showing Operation Of Automatic Shifter
Photocopy Of Drawing, Spans 1 - 11, Geometrical And Distorted Lengths
HB409689
Photocopy Of Drawing, Spans 1 - 11, Geometrical And Distorted Lengths


Data Pages


Photo Caption Pages


Item Title


Location
Spanning Mississippi River, Keokuk, IA

Find maps of Keokuk, IA


Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER IA-3
Building/structure dates: 1916 initial construction
Building/structure dates: 1952 subsequent work
Building/structure dates: 1956 subsequent work
Building/structure dates: 1957 subsequent work
Significance: The Keokuk & Hamilton Bridge is one of three remaining in Iowa that were designed by Ralph Modjeski, one of this country's premier early 20th century bridge engineers. The eleven-span, double-deck steel superstructure was built in 1915-1916 on piers retained from an earlier (1869-1871) structure, to meet greater loading requirements from railroads that operated across the Mississippi at this point. The Keokuk & Hamilton Bridge Company was incorporated in 1868 to further railroad and commercial development in Keokuk and in Hancock County, Illinois. The firm's president until 1914 was Andrew Carnegie, who had interest in the railroad participating in the venture. The first Keokuk & Hamilton Bridge was built by Carnegie's Keystone Bridge Co. from designs by Thomas Curtis Clarke, later a founder of Clarke, Reeves & Co. (which is best known under its subsequent name, Phoenix Bridge Co.). This structure stood until 1915, when pressure from Keokuk businessmen and the threatened erection of a competing bridge forced the Keokuk & Hamilton Bridge Co. to reconstruct its span. The replacement structure remained in corporate ownership until January 1949, when it was turned over to the city of Keokuk. Although the city intended that there should be no tolls for vehicular traffic, the span remained "free" for only three years. Tolls were reimposed in 1952, in order to finance maintenance and also major repairs to the piers, which were rejacketed with reinforced concrete in 1951-1952.

Related Names
Modjeski, Ralph
Keokuk & Hamilton Bridge Company
Carnegie, Andrew


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
1. GENERAL VIEW FROM UPSTREAM ON THE IOWA SHORE, LOOKING S. PHOTOGRAPHER: SARAH J. DENNETT
2. GENERAL VIEW FROM DOWNSTREAM ON THE ILLINOIS SHORE, LOOKING NNE. PHOTOGRAPHER: SARAH J. DENNETT
3. GENERAL VIEW FROM UPSTREAM ON THE ILLINOIS SHORE, LOOKING WSW. PHOTOGRAPHER: SARAH J. DENNETT
4. THREE-QUARTER VIEW FROM DOWNSTREAM ON THE IOWA SHORE, LOOKING E (SWING SPAN PARTIALLY OPEN.) PHOTOGRAPHER: SARAH J. DENNETT
5. THREE-QUARTER VIEW FROM DOWNSTREAM ON THE ILLINOIS SHORE, LOOKING NNW. PHOTOGRAPHER: HANS MUESSIG
6. KEOKUK HIGHWAY APPROACH AND TOLLBOOTH, LOOKING ESE. PHOTOGRAPHER: ROBERT A. RYAN
7. KEOKUK HIGHWAY APPROACH FROM SWING SPAN FENDER, LOOKING WNW. PHOTOGRAPHER: ROBERT A. RYAN
8. TOLLBOOTH AT KEOKUK: NORTHWEST ELEVATION. PHOTOGRAPHER: SARAH J. DENNETT
9. KEOKUK HIGHWAY APPROACH TRESTLE, LOOKING NE. PHOTOGRAPHER: SARAH J. DENNETT
10. KEOKUK HIGHWAY APPROACH TRESTLE. PHOTOGRAPHER: SARAH J. DENNETT
11. KEOKUK RAILROAD APPROACH. PHOTOGRAPHER: ROBERT A. RYAN
12. KEOKUK RAILROAD APPROACH, SHOWING ORIGINAL STONE WALL AND ROADBED, LOOKING NW. PHOTOGRAPHER: SARAH J. DENNETT
13. KEOKUK APPROACH SHOWING THE SEPARATION OF THE HIGHWAY AND RAILROAD ALIGNMENTS. PHOTOGRAPHER: SARAH J. DENNETT
14. ONE BENT ON THE KEOKUK HIGHWAY APPROACH TRESTLE. PHOTOGRAPHER: SARAH J. DENNETT
15. GENERAL DECK VIEW, KEOKUK HIGHWAY APPROACH, LOOKING E TOWARD THE BRIDGE. PHOTOGRAPHER: ROBERT A. RYAN
16. SWING SPAN: UPSTREAM ELEVATION, LOOKING SSW. PHOTOGRAPHER: ROBERT A. RYAN
17. SWING SPAN: DOWNSTREAM ELEVATION, LOOKING NNE. PHOTOGRAPHER: ROBERT A. RYAN
18. SWING SPAN: THREE-QUARTER VIEW FROM DOWNSTREAM ON IOWA SHORE, LOOKING NE. PHOTOGRAPHER: SARAH J. DENNETT
19. SWING SPAN: CENTER TOWER AND BRIDGE TENDER'S HOUSE. PHOTOGRAPHER: ROBERT A. RYAN
20. SWING SPAN: RAILROAD DECK. PHOTOGRAPHER: ROBERT A. RYAN
21. BRIDGE TENDER'S HOUSE FROM RAILROAD DECK, LOOKING SE. PHOTOGRAPHER: SARAH J. DENNETT
22. INTERIOR OF BRIDGE TENDER'S HOUSE SHOWING CLUTCH AND BRAKE HANDLES, AIR VALVE FOR RAIL LOCKS, AND MOTOR CONTROLLER FOR TURNING MACHINERY, LOOKING N. PHOTOGRAPHER: SARAH J. DENNETT & ROBERT A. RYAN
23. INTERIOR OF BRIDGE TENDER'S HOUSE SHOWING INDICATORS FOR RAIL LOCKS AND END LIFT MACHINERY (RIGHT), LOOKING ESE. PHOTOGRAPHER: SARAH J. DENNETT & ROBERT A. RYAN
24. REDUCTION GEARING FOR SWING MACHINERY; ALSO SHOWING DRIVE PINION, RACK AND ROLLERS. PHOTOGRAPHER: HANS MUESSIG
25. DRUM, SHOWING LOWER CHORD AT DRUM, PINION GEAR AND DRIVE SHAFT, RACK, AND ROLLERS. PHOTOGRAPHER: HANS MUESSIG
26. DRUM, SHOWING ROLLERS AND RACK. PHOTOGRAPHER: ROBERT A. RYAN
27. INTERIOR OF DRUM, OVERALL VIEW. PHOTOGRAPHER: SARAH J. DENNETT & ROBERT A. RYAN
28. INTERIOR OF DRUM SHOWING RADIAL STAYS FOR DRUM AND WHEEL FRAME. PHOTOGRAPHER: HANS MUESSIG
29. BARREL SHOT OF SWING SPAN IN OPEN POSITION. PHOTOGRAPHER: HANS MUESSIG
30. END FLOOR BEAM AND LIFTING JACKS ON SWING SPAN LOOKING TOWARD CENTER TOWER. PHOTOGRAPHER: HANS MUESSIG
31. END FLOOR BEAM AND LIFTING JACKS ON SWING SPAN, LOOKING AWAY FROM THE CENTER TOWER. PHOTOGRAPHER: ROBERT A. RYAN
32. SWING SPAN: HIGHWAY DECK, SHOWING AUTOMOBILE BARRICADES. PHOTOGRAPHER: SARAH J. DENNETT
33. UPPER CONNECTIONS AT SWING SPAN CENTER TOWER. PHOTOGRAPHER: ROBERT A. RYAN
34. TOP CHORD OF ILLINOIS ARM OF SWING SPAN. PHOTOGRAPHER: ROBERT A. RYAN
35. INSIDE VIEW OF THE TOP CHORD-ENDPOST CONNECTION ON THE SWING SPAN. PHOTOGRAPHER: ROBERT A. RYAN
36. SWING SPAN: BOTTOM CHORD CONNECTION AT 5L. PHOTOGRAPHER: ROBERT A. RYAN
37. BOTTOM CHORD CONNECTION AT CENTER TOWER AND DRUM. PHOTOGRAPHER: ROBERT A. RYAN
38. SWING SPAN: BOTTOM CHORD CONNECTION AT 4L. PHOTOGRAPHER: HANS MUESSIG
39. SWING SPAN: ABUTMENT AND ENDPOST. PHOTOGRAPHER: ROBERT A. RYAN
40. SWING SPAN: LIFTING AND LOCKING JACKS ON ABUTMENT. PHOTOGRAPHER: HANS MUESSIG
41. RAIL LOCKS ON SWING SPAN. PHOTOGRAPHER: HANS MUESSIG
42. UPSTREAM ELEVATION OF THE TWO PARKER SPANS, LOOKING SSE. PHOTOGRAPHER: ROBERT A. RYAN
43. THREE-QUARTER VIEW OF PARKER SPAN FROM DOWNSTREAM ON IOWA SHORE, LOOKING NE. PHOTOGRAPHER: HANS MUESSIG
44. PIER 2 FROM PIER 1, SWING SPAN OPEN; BARREL SHOT OF PARKER TRUSS. PHOTOGRAPHER: HANS MUESSIG
45. TOP CHORD OF PARKER SPAN FROM WALKWAY. PHOTOGRAPHER: ROBERT A. RYAN
46. PARKER SPAN: TOP CHORD CONNECTION 4L. PHOTOGRAPHER: SARAH J. DENNETT
47. PARKER SPAN: CONNECTION BETWEEN ENDPOST AND TOP CHORD. PHOTOGRPAHER: HANS MUESSIG
48. HIGHWAY FLOORBEAM ATTACHMENT TO VERTICALS OF PARKER SPAN. PHOTOGRAPHER: HANS MUESSIG & SARAH J. DENNETT
49. PARKER SPAN: BOTTOM CHORD CONNECTION 2L. PHOTOGRAPHER: HANS MUESSIG & SARAH J. DENNET
50. PARKER SPAN: BOTTOM CHORD CONNECTION AT 4L. PHOTOGRAPHER: ROBERT A. RYAN
51. DOWNSTREAM ELEVATION OF PRATT SPAN, LOOKING NNE. PHOTOGRAPHER: HANS MUESSIG
52. THREE QUARTER VIEW OF PRATT SPANS, LOOKING NNW. PHOTOGRAPHER: HANS MUESSIG
53. PORTAL OF PRATT SPAN AT HAMILTON END. PHOTOGRAPHER: HANS MUESSIG
54. DECK OF PRATT SPAN, LOOKING ESE TOWARD ILLINOIS SHORE. PHOTOGRAPHER: ROBERT A. RYAN
55. HAMILTON ABUTMENT. PHOTOGRAPHER: HANS MUESSIG
56. PRATT SPAN: FIXED SHOE ON HAMILTON ABUTMENT. PHOTOGRAPHER: ROBERT A. RYAN
57. INTERIOR OF PRATT SPAN SHOWING TOP LATERAL BRACING, TOP CHORD, AND TRUSS PANEL, LOOKING NW. PHOTOGRAPHER: HANS MUESSIG
58. PRATT SPAN: CONNECTION BETWEEN TOP CHORD AND INCLINED END POST. PHOTOGRAPHER: HANS MUESSIG
59. PRATT SPAN: TOP CHORD CONNECTION 2L. PHOTOGRAPHER: HANS MUESSIG
60. PRATT SPAN: BOTTOM CHORD CONNECTION 3R. PHOTOGRAPHER: ROBERT A. RYAN & HANS MUESSIG
61. BOTTOM CHORD AND LATERAL BRACING OF PRATT SPAN AND PIER 11. PHOTOGRAPHER: HANS MUESSIG
62. PRATT SPAN: BOTTOM CHORD AND LATERAL BRACING. PHOTOGRAPHER: HANS MUESSIG
63. HAMILTON RAILROAD AND HIGHWAY APPROACH. PHOTOGRAPHER: ROBERT A. RYAN
64. ILLINOIS HIGHWAY APPROACH LOOKING E. PHOTOGRAPHER: ROBERT A. RYAN
65. HAMILTON APPROACH LOOKING TOWARD BRIDGE, SHOWING TRANSFER OF THE HIGHWAY APPROACH TO THE BRIDGE STRUCTURE. PHOTOGRAPHER: ROBERT A. RYAN
66. TRUSS WORK AT ROADWAY CURVE ON TO BRIDGE, LOOKING NW. PHOTOGRAPHER: ROBERT A. RYAN
67. PHOTOCOPY OF POSTCARD (ORIGINAL IN THE POSSESSION OF THE STATE HISTORICAL SOCIETY OF IOWA) POSTMARK 1906 ORIGINAL (1869-71) KEOKUK AND HAMILTON BRIDGE, FROM NORTHWEST
68. PHOTOCOPY OF POSTCARD (ORIGINAL IN THE POSSESSION OF THE STATE HISTORICAL SOCIETY OF IOWA) WESTERN MERCANTILE CO., KEOKUK, IOWA; POSTMARK 1911 ORIGINAL (1869-71) KEOKUK AND HAMILTON BRIDGE, FROM WSW
69. PHOTOCOPY OF PHOTOGRAPH (ORIGINAL IN THE POSSESSION OF THE STATE HISTORICAL SOCIETY OF IOWA) DATED 5 JULY 1913 ORIGINAL (1869-71) KEOKUK AND HAMILTON BRIDGE, FROM N
70. PHOTOCOPY OF PHOTOGRAPH (ORIGINAL IN THE POSSESSION OF THE STATE HISTORICAL SOCIETY OF IOWA) ANSCHUTZ, PHOTOGRAPHER, C. 1913 ORIGINAL (1869-71) KEOKUK AND HAMILON BRIDGE, FROM N
71. PHOTOCOPY OF POSTCARD (ORIGINAL IN THE POSSESSION OF THE STATE HISTORICAL SOCIETY OF IOWA) L. L. COOK CO., MILWAUKEE, NO POSTMARK SECOND (1915-1916) KEOKUK AND HAMILTON BRIDGE, FROM NW
72. PHOTOCOPY OF DRAWING, GENERAL ELEVATION AND PLAN, 1' = 80' (INCLUDES ENTIRE BRIDGE)
73. PHOTOCOPY OF DRAWING, SUBSTRUCTURE, PIERS 1 - 11 INCLUSIVE, 3/16' = 1'
74. PHOTOCOPY OF DRAWING, STRESS SHEET, SPAN 4, 1' = 10' (PRATT, 160' 5 1/4')
75. PHOTOCOPY OF DRAWING, STRESS SHEET, SPAN 7, 1' = 10' (PRATT, 146' 11 7/8')
76. PHOTOCOPY OF DRAWING, STRESS SHEET, SPANS 8 - 11 INCLUSIVE, 1' = 10' (PRATTS, 162' 8 3/8')
77. PHOTOCOPY OF DRAWING, SPANS 4 - 11, TRUSSES, 3/4' = 1' (HALF ELEVATION, SEVERED)
78. PHOTOCOPY OF DRAWING, FLOOR AND BRACING, SPANS 4 11 INCLUSIVE, 3/4' = 1'
79. PHOTOCOPY OF DRAWING, END BEARINGS, SPANS 4 11 INCLUSIVE, 3/4' = 1'
80. PHOTOCOPY OF DRAWING, STRESS SHEET, SPANS 2 AND 3, 1' = 20' (PARKERS, 254' 5 1/4')
81. PHOTOCOPY OF DRAWING, SPANS 2 AND 3, TRUSSES LO - L2, 3/4' = 1' (ELEVATION, SEVERED)
82. PHOTOCOPY OF DRAWING, SPANS 2 AND 3, TRUSSES L3 - L4, 3/4' = 1' (ELEVATION, SEVERED)
83. PHOTOCOPY OF DRAWING, SPANS 2 AND 3, FLOORS AND BRACING, 3/4' = 1' (PLAN VIEWS)
84. PHOTOCOPY OF DRAWING, SPANS 2 AND 3, LATERALS, 3/4' = 1' (TOP AND BOTTOM LATERAL BRACING)
85. PHOTOCOPY OF DRAWING, SPANS 2 AND 3, END FLOOR BEAM AND BRACING, 3/4' = 1'
86. PHOTOCOPY OF DRAWING, SPANS 2 AND 3, END BEARINGS, 1 1/2' = 1'
87. PHOTOCOPY OF DRAWING, SPAN 1, STRESS SHEET, 1' = 15' (SWING SPAN, 377' 1 1/2')
88. PHOTOCOPY OF DRAWING, SPAN 1, TRUSSES LO - L3 INCLUSIVE, 3/4' = 1' (ELEVATION, SEVERED)
89. PHOTOCOPY OF DRAWING, SPAN 1, TRUSSES L4 - L6' INCLUSIVE, 3/4' = 1' (ELEVATION, SEVERED)
90. PHOTOCOPY OF DRAWING, SPAN 1, CENTER SUPPORT FOR WIRES AND LAMP, VARIOUS SCALES
91. PHOTOCOPY OF DRAWING, SPAN 1, FLOORS AND BRACING, 3/4' = 1' (SECTION AND PLAN)
92. PHOTOCOPY OF DRAWING, SPAN 1, BOTTOM LATERALS, 3/4' = 1'
93. PHOTOCOPY OF DRAWING, SPAN 1, DETAILS OF DRUM, 3/4' = 1' (ELEVATION, PLAN, AND SECTION)
94. PHOTOCOPY OF DRAWING, SPAN 1, TURNTABLE, 3/4' = 1'
95. PHOTOCOPY OF DRAWING, SPAN 1, DETAILS OF TURNTABLE MACHINERY, 3/4' and 1 1/2' = 1' (CENTER CONE, RADIAL STRUT RING, TRACK, ROLLERS, PINION GEARS)
96. PHOTOCOPY OF DRAWING, SPAN 1, POWER GEARING, 3/4' = 1'
97. PHOTOCOPY OF DRAWING, SPAN 1, END LIFT MACHINERY, 3/4' = 1'
98. PHOTOCOPY OF DRAWING, SPAN 1, GENERAL ARRANGEMENT OF RAIL LOCK AND END LIFT MACHINERY, 3/4' = 1'
99. PHOTOCOPY OF DRAWING, SPAN 1, RAIL LATCH, 3' and 6' = 1'
100. PHOTOCOPY OF DRAWING, SKETCHES SHOWING OPERATION OF AUTOMATIC SHIFTER
101. PHOTOCOPY OF DRAWING, SPANS 1 - 11, GEOMETRICAL AND DISTORTED LENGTHS


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