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May 1940. "Scraps of paper blowing on bridge." St. Louis, Missouri. 35mm nitrate negative by John Vachon for the Farm Security Administration. View full size.
I agree the booth says, "Welcome to St. Louis." Below the booth window I can read, "Pay Bridge Toll Here."
Question: Was the Eads Bridge a toll bridge?
Beyond that, I've nothing to offer. Good photo, though.
I think this must be the west end of the Eads Bridge.
The white booth in the middle of the road at the extreme right appears to say in part: "Welcome to St. Louis."
The buildings in the foreground, seemingly right up against the riverfront, are not inconsistent with Laclede's Landing. And the other, taller buildings of downtown St. Louis are where they should be if this picture is looking southwest.
Finally compare the decorative railings in this picture with the railings in this postcard view of the Eads:
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