| Crimping of web stiffening angles | 94 | |
| Cross-section paper for bridge calculations | 332 | |
| Cross-ties | 141 | |
| Crowfoot seams | 297 | | |
| Cupped bearings for end rollers of draw-spans | 210 | |
| Curvature in chords, appearance of | 20 | |
| Curvature of arches | 84 | |
| Curvature of top chord | 51 | |
| Curved members in English bridges | 20 | |
| Curved members, objections to | 19 | |
| Curve of pressure for masonry piers | 305 | 306 |
| Curves of weights for cantilever bridges | 72 | 74 |
| Cutting off idle corners | 254 | |
| Cutting off tops of columns of elevated railroads | 99 | |
| Cylinder piers | 311 | |
| Cypress | 299 | | |
| Damages | 263 | |
| Dapping ties | 142 | | |
| Data for elevated railroads | 102 | 331 |
| Data for layout of structure | 330 | |
| Data for spans, list of | 332 | |
| Data, necessity for complete | 18 | |
| Dead load | 152 | |
| Dead load, preliminary | 333 | |
| Dead-load reactions in draw-spans, upward assumed | 122 | |
| Dead loads for draw-spans | 184 | | |
| Dead-load stresses | 333 | |
| Dead-load stresses in draw-spans | 122 | |
| Decoration, legitimate and illegitimate | 46 | |
| Defective work | 262 | |
| Defects in timber | 299 | |
| Deflection of draw-spans | 212 | |
| Demoralized inspection | 282 | 283 |
| Depth of truss, economic | 30 | |
| Depths, effective | 145 | |
| Depths of arches | 84 | |
| Depths of drums | 123 | |
| Depths of longitudinal girders for elevated railroads | 102 | |
| Depths of trusses for draw-spans | 183 | |
| Designing, errors in | 5 | |
| Designing of piers | 301 | |
| Des Moines River Bridge piers | 315 | |
| Detail drawings | 243 | |
| Detail drawings, method of making | 337 | 338 |
| Detailing | 138 | |
| Detailing of members having excessive strength | 23 | |