I recently took an nostalgia walk through the Loop on each side of the "Chicago River" because 50 years earlier, I had earned grad school tuition by working as a deckhand on a towboat plying the canal from Lake Michigan down to Joliet IL.
Needless to say, the scenery has changed drastically since those early 1970s. The Marina Towers (center left) had just been completed back then, amidst much hoopla. The drawbridges looked the same, but apparently they no longer function to let towboats and their "tows" come under. (In the old days, we often pushed one 35'x 195' barge full of 1500 tons of sugar to the Curtis Candy dock, out in the lake.)
I used a Nikon D800 with Nikkor 24-70mm zoom on a Vanguard Alta Pro travel tripod (a tad light for the job, necessitating mirror lock-up). Fortunately, no cars crossed the vibration-prone bridge I was on during, or for a minute before, my shots.