The pictures below of the Mighty Mac Bridge reminded me of a story told by my uncle. One of his Air Force friends from the late/ mid fifties was given a discharge from the Air Force. It seems he was stationed at nearby Kincheloe AFB and flew his plane under the bridge. It was the SAC bomber that had the rear facing props. Guy K probably knows the type of plane -- a "B forty-something".
That is how high this bridge is.
Last night I could not sleep so look what I did. Do not get used to it, I am not sure it is permanent yet.