Portfolio #1: Chicago Bridge Lift. October 19, 2019. Outer Drive to Wabash Avenue, Main Branch, Chicago River.

By Divi Logan, Photographer and Author

These are among the best of over 380 photographs taken October 19, 2019, during boat runs and bridge lifts along the Main Branch of the Chicago River. Photographs of the structure follow the bridge’s title.

Lake Shore/ Outer Drive Bridge. Conditions for the lift included glare from waterways and buildings along the river (lesson takeaway will be to purchase a high-quality circular polarizing filter and also challenge myself to try more manual focus fine-tuning). Structures shown include the deck truss web, inspectors, inspection equipment, bridge houses with tenders inside, and elements of bridge substructures and superstructures. As each bridge lift, the boats, collected between bridges, sail under the massive spans, some weighing 2,500 tons.

CBL2 Outer Drive Up #2 101919 0926

CBL2 Outer Drive Up #4 101919 0926

CBL2 Outer Drive Up #6 101919 0926

CBL2 Outer Drive Half Up 101919 0927 #2

CBL2 Outer Boats @ Columbus Dr 101019 0938

As the morning was on the chilly side I went for a fresh, hot coffee. By the time I emerged the Columbus Drive Bridge was already up and glassy glare was evident, so I took a few pictures of it and then positioned for the raising of the DuSable Bridge at Michigan Avenue. This best of the Columbus Drive pictures is the south leaf.

CBL2 Columbus Drive Up 101919 1004 AM #2

The DuSable Bridge at Michigan Avenue is a magnificent double-deck, double-leaf bascule with four bridge tender’s houses; you can see their bridge operators. During each lift, crews of CDOT inspectors staff each bridge to ensure everything runs efficiently.

CBL2 DuSable BEST 2 Houses 101919 1010 #1

CBL2 DuSable House + Personnel 101919 1012.JPG

CBL2 DuSable Up 1 101919 1014

CBL2 DuSable Up 4 101919 1014

CBL2 DuSable Up 6 101919 1014

CBL2 DuSable Up 9 101919 1014

CBL2 DuSable Up 1 101919 1015 #2

CBL2 DuSable Half Up #A 101919 1015

CBL2 DuSable Substructure #1 101919 1016

CBL2 DuSable Substructure Wide 101919 1016

CBL2 DuSable Up + Houses 101919 1018

CBL2 DuSable From Upper RWalk 101919 1018

CBL2 DuSable Still Up 101919 1021

CBL2 DuSable From Wabash Tele 101919 1023 AM

The Wabash Avenue Bridge was open before the DuSable Bridge closed.

CBL2 Wabash Ave from DuSable 101919 918 AM #3.JPG

CBL2 Wabash Avenue Up 101919 1019 #5

CBL2 Wabash Ave Substructure 101919 1019 1.JPG

CBL2 Wabash Ave N Span Up, Lights, House 101919 1020 #1

CBL2 Wabash Ave N Span Up, Lights, House 101919 1020 #2.JPG

CBl2 Wabash Ave Boats Through 101919 1021

CBL2 Wabash Ave N Leaf Center 101919 1022

CBL2 Wabash Ave N Leaf Center 101919 1022 #5

CBL2 Wabash Ave 2 Up 101919 1025.JPG

CBL2 Wabash Ave Descent SubAbut 101919 1026 #3

CBL2 Wabash Ave Descent SubAbut 101919 1026 #6

CBL2 Wabash Ave Descent SubAbut 101919 1026 #10.JPG

Features of bascule bridges include double-leaf spans, navigation lights, floor cantilever beams for sidewalks, elaborate floor bracing systems with lateral crossings, and in the case of many seen here, pony truss superstructures.

Divi Logan. Chicago, October 22, 2019.

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