CONTENTS.

Page 1.

5 2.

7 3.

8 4.

16 5.

25 6.

26 7.

27 8.

28 9.10 .11 .1 9

APPENDICES.

13.

14.

A. List of Engineers, Employees and Contractors. 29 15.

B. Act of Congress, approved February 26, 1885. 30 16.

C. Act of Congress, approved April 24, 1888. 31 17.

D. Contract with War Department. 32 18.

E. Report of February 15, 1887. 33 19.

F. Report of August 2, 1888. 37 20.

G. Argument for Amendment of Charter. 39 21.

H. Ordinance of Taxing District, passed March 23, 1891. 42 22.

I. Cost of Sinking Foundations. 45 23.

J. Progress of Sinking Foundations. 54 24.

K. Specifications for Masonry. 63 25.

L. Specifications for Superstructure. 65 26.

M. Supplementary Specifications, May 6, 1890. 70 27.

N. Supplementary Specifications, January 1, 1891 . 71 28.

O. Tests of Pull Sized Eye Bars.. 72 29.

P. Report of Testing Committee . 74 30.

SUBJECTS.

I. Preliminary Narrative.

II. General Description.

III. Substructure.

IV. Superstructure.

V. Viaduct.

VI. Approaches.

VII. Shore Protection.

VIII. Cost.

LIST OF PLATES.

General Map.

Bridge and Immediate Vicinity.

Profile and Alignment.

General Elevation and Plan.

Profile showing Stratification on Bridge Line.

Water Record at Government Gauge, seven years.

Water Record, Government and Bridge Gauges, four years.Record of Soundings, seven typical dates.

East Abutment.

Anchorage and Small Piers.

Pier I.

Caisson, Pier I.

Pier II.

Pier III.

Position of Mats at Piers II and III.

Caisson, Pier II.

Caisson, Pier III and Cutting Edge.

Stratification of Clay at Pier III.

Pier IV.

Caisson, Pier IV.

Pier V.

Weaving Barges.

Anchorage of Caisson III.

Launching Ways.

Clay Hoist and Sand Pump.

Special Hoist and Lock.

Concrete Mixing Plant.

Diagram of Sinking Progress.

Elevation, Anchorage Span.

Elevation and Section, Anchorage Span.

31. Elevation, Cantilever Arm.

32. Elevation, Central Span.

33. Elevation and Section, Central Span.

34. Elevation, Intermediate Span.

35. Elevation and Section, Intermediate Span.

36. Viaduct East of Anchorage.

37. Anchorage Connection.

38. Bearings, Piers I and III.

39. Expansion Bearing, Pier II.

40. Bearing, Pier IV.

41. Joints in Chords, Central Span.

42. U 0 Panel Point, Central Span.

43. Expansion Joints, Intermediate Span.

44. Adjustment at Ends, Intermediate Span.

45. Adjustments at Center, Intermediate Span.

46. Elevation, Deck Span.

47. Elevation and Section, Deck Span.

48. Details, Deck Span.

49. Floor.

50. Strain Sheet, Intermediate Span.

51. Strain Sheet, Cantilever Arm.

52. Strain Sheet, Anchorage Arm.

53. Strain Sheet, Central Span.

54. Strain Sheet Details, Central Span

55. Strain Sheet, Deck Span.

56. West Approach Viaduct.

57. West Approach Piers.

58. Details, West Approach Viaduct.

59. Viaduct Floor and Girders.

60. Highway Approach.