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Heel or rear locks are necessary to prevent the leaves from opening when live loads pass over the part of the bridge between the trunnions and the rear break in the floor. Each leaf is provided with two pairs of rear locks, each pair being placed between the inside and outside trusses. The four locks
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shear from one leaf to the other. This center lock consists of a set of four female castings bolted to the river end of one leaf, and a second set of four male units bolted to the river end of the other leaf, all castings being on the centerlines of the trusses. The male unit consists of two castings
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and
Seventh Street, made possible by the use of the bridge rather than Michigan Avenue. The delay cost estimated to be one cent per car per minute (60 cents per hour for the value of time or the value of fuel saved) resulted in a savings in vehicle operation of $ 584,000 per annum; that amount
513:. Each gear train is connected to two 100-horsepower main operating motors, only one of which is to be used at a time. The time required for opening or closing the bridge against a 28-mile-per-hour (45 km/h) wind is stated to be 57.6 seconds, of which 10 seconds is for
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521:. The main operating racks are bolted to the underside of the outside trusses, the pitch radius being 20 feet (6.1 m). The operating pinion, with a pitch diameter of 40 inches (100 cm), is mounted on a shaft of the gear train.
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Heavy locking devices are provided at the center of the bridge and at the rigid in its closed position. The center lock in addition to holding the leaves together in their closed position, also transmits
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capitalized at 5% would indicate that $ 23,360,000 could properly be spent to eliminate this delay, in the eyes of the decision makers at the time of the construction. From the perspective of
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472:, the allotment for the bridge was revoked until the districts were all in position to comply. The total cost of the Outer Drive is estimated at $ 11,563,000.
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in the world. The Outer Drive itself, now known as Lake Shore Drive, links the south side to the north side of the city, running along the western shore of
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of a leaf are connected by shafting, and operation by means of two 15-horsepower motors set either side of the centerline of the bridge" (April 22, 1937).
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While the completion of the Outer Drive was considered one of the most important projects in the PWA it took many years to complete. A main issue was
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595:"Chicago Gets Added PWA Funds for Outer Drive Completion," Engineering News-Record, v. 115 (December 5, 1935): 795-796.
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601:"Lakefront Boulevard Link Forms Milestone in Chicago Plan," Engineering News-Record, v. 118 (April 15, 1937): 546-548.
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493:, this savings calculation justified the Outer Drive bridge project, showing a possible saving of $ 11,797,000.
376:, using Hugh E. Young as the consulting engineer, was designed by the Strauss Engineering Company, built by the
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Chicago River
Bascule Bridge, Outer Drive, Spanning Chicago River at Outer (Lakeshore) Drive, Chicago, Cook, IL
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598:"Continuous Girders Top Rigid Frame Viaduct Bents," Engineering News-Record, V. 118 (May 6, 1937): 671-673.
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592:"A Record Size Bascule," Engineering News-Record, v. 118 (April 22, 1937): 583-587.
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List of bridges documented by the
Historic American Engineering Record in Illinois
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364:'s infrastructure projects in Chicago. The bridge was officially named the
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was meant to create many jobs for
Chicagoans and ease traffic flow on
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of the city to the Loop, across this Outer Drive Bridge over the
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of 40,000 vehicles per day on a saving of eight minutes between
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428:. In 1937 this structure was the longest, widest, and heaviest
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in 1982 to honor the centennial anniversary of the birth of
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Bridge raised for sailboats, viewed looking east, toward
623:"Dedication of the Outer Drive Bridge: Aerial View"
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16:Bascule bridge in Chicago, Illinois, United States
35:The double-decker Outer Drive Bridge across the
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653:"Lake Shore Drive Bridge - Outer Drive Bridge"
505:, "Each leaf is to be operated by two sets of
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366:Franklin Delano Roosevelt Memorial Bridge
122:Franklin Delano Roosevelt Memorial Bridge
468:. Due to a lack of provided security by
184:Columbus Drive (William P. Fahey) Bridge
86:Motor vehicles, cyclists, pedestrians on
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638:"Outer Drive Bridge Dedication, 1937"
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612:Historic American Engineering Record
155:Chicago Department of Transportation
764:Truss bridges in the United States
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436:. It extends from its origin in
252:1 main span and 3 approach spans
197:Double-leaf, double-deck, fixed
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759:Pedestrian bridges in Illinois
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1:
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509:, consisting of four sets of
744:Bascule bridges in Illinois
408:View of bridge towards the
362:Public Works Administration
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132:Centennial anniversary of
739:Bridges completed in 1937
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370:Franklin Delano Roosevelt
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754:Road bridges in Illinois
614:(HAER) No. IL-54, "
480:Calculations based on a
372:. It was planned by the
346:DuSable Lake Shore Drive
503:Engineering News-Record
378:American Bridge Company
374:Chicago Plan Commission
233:80.7 feet (24.6 m)
134:Franklin D. Roosevelt's
89:Chicago Lakefront Trail
67:41.888417°N 87.614056°W
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476:Economic justification
470:Chicago Park Districts
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285:Ketler-Elliott Company
710:Columbus Drive Bridge
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517:and 2.86 seconds for
491:engineering economics
416:The building of this
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272:Engineering design by
225:356 feet (109 m)
72:41.888417; -87.614056
384:Significance/purpose
336:, also known as the
241:264 feet (80 m)
684:Chicago Harbor Lock
410:Chicago Harbor Lock
340:, is a double-deck
175:Chicago Harbor Lock
63: /
734:Bridges in Chicago
690:Outer Drive Bridge
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400:The bridge in 1987
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334:Outer Drive Bridge
290:Construction start
23:Outer Drive Bridge
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583:Chicago’s Bridges
564:Quarantine Speech
412:and Lake Michigan
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641:. Retrieved
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519:deceleration
515:acceleration
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482:traffic flow
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438:Jackson Park
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238:Longest span
222:Total length
58:87°36′50.6″W
55:41°53′18.3″N
507:gear trains
424:and in the
348:across the
338:Link Bridge
306:Inaugurated
181:Followed by
171:Preceded by
166:16603027328
70: /
45:Coordinates
728:Categories
706:Downstream
570:References
541:forming a
486:Oak Street
454:North Side
442:South Side
538:live load
530:Navy Pier
450:Edgewater
344:carrying
162:ID number
128:Named for
680:Upstream
553:See also
358:Illinois
322:Location
262:Designer
249:of spans
212:Material
203:trunnion
466:funding
440:on the
354:Chicago
314:Rebuilt
257:History
113:Chicago
99:Crosses
83:Carries
643:2 June
628:2 June
543:toggle
418:bridge
194:Design
109:Locale
460:Funds
230:Width
216:Steel
141:Owner
136:birth
645:2011
630:2011
426:Loop
332:The
317:1987
301:1937
293:1929
91:and
352:in
247:No.
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