According to insurance company estimates made before building started, thirteen men would die while making the St. Louis Arch. How many men actually did?

Fortunately, the predictions were a bit pessimistic. According to this source, no one lost their lives. I had the pleasure of seeing the Arch up close and personal while on a tour to St. Louis and Branson four years ago. Seeing the Arch was very impressive. What was even more impressive is that the pinheads that ran the tour sent a bus driver who had no idea how to get from St. Louis to Branson nor how to get around in St. Louis yet managed to get us to where we were supposed to go with a minimum of difficulty.

Interesting link from Jelp. Though I'm not sure I'd agree that in 1965 "cars had fins." 1965 Cars (Popular Mechanics).

Got it, Jelp. No lives were lost constructing the Arch. That may have been the only unexpected event, or non-event, in the construction. When it was time to fit the last piece in, in the middle at the top, it was found that there was a very slight misalignment, due to the warming of the south leg by the sun's rays. So the fire trucks that were sitting there hosed the south side down. That was why the fire trucks were there. The expansion was planned for. The water cooled the stainless steel, the two legs came into alignment, and the trucks, their work done, went back to the fire station.

Jelp, the St. Louis area is very easy to navigate in, except for the perpetual road work on Interstate 64.

Professor, the 65 cars(and the 66 cars, which were out when the Arch wasw completed) didn't have fins, but fins were seen on some new cars until at least 61 or 62.
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Additional Gateway Arch facts

Stainless Steel Plate Exterior Skin 886 Tons (804 metric tons)

Total Steel Weight 5,199 tons (4,644 metric tons)

Total Concrete Weight 38,107 Tons (34,570 metric tons)

Outer Width - Outside North Leg to Outer South Leg 630' (192m)

Maximum Height 630' (192m)

Shape of Arch Section Equilateral Triangle

Number of Sections in Arch 142

Dimension of Arch at Base 54 ft. (16.46m)

Dimension of Arch at Top 17 ft. (5.18m)

Size of Windows Approx. 7" x 27" (180 mm x 690 mm)

Size of Observation Room 7' 2" x 65' x 6' 9" high (2.18m x 19.8m x 2.06m)

Capacity of Observation Platform 100 - 140 persons

Stairs (for emergency maintenance use only)
Number of steps 1,076
Number of Landings 105

On a clear day the view at the top can extend up to thirty miles in either direction. However, St. Louis can be a very hazy city which reduces visibility at the top. On cool, damp mornings a dense fog can create zero visibility at the top.

"Capsule Trains" or "Trams" operated by Bi-State Development Agency
Number of Transporters 2
Number of Capsules per Transporter 8
Capacity per Capsule 5 persons*
Number of Times DG has traveled in one of those very cramped "5 person cars" - 2 (One trip up, and another down. The only reason I went up was to take my son.)

*Notice that they do not clam "5 persons comfortably."