Kevin passed along this article this morning and commented
QuoteThe Marsh Station section of I-10 was the first section of highway in Arizona built using Interstate Highway funds, as US 80, in 1955-56. Those who have driven it know of the narrow geometrics of this section of freeway and lack of median.
2 bridges demolished east of Tucson (http://www.azcentral.com/news/articles/2011/04/11/20110411arizona-interstate-10-bridges-demolished.html)
QuoteThe Arizona Department of Transportation has knocked down two bridges on Interstate 10 east of Tucson.
The two bridges were demolished in about 10 hours beginning Friday. I-10 was reopened by Saturday morning.
The Marsh Station Interchange, which was completed in December, replaces one of the demolished bridges. By the end of the year, a new bridge is expected to replace the other demolished structure, the Mescal/J-Six Bridge, which recently was the site of a fire when two semitrucks collided.
Read more: http://www.azcentral.com/news/articles/2011/04/11/20110411arizona-interstate-10-bridges-demolished.html#ixzz1JJjoqrQK
1978 Thomas Guide showing Phoenix area for I-10 freeway
http://i1118.photobucket.com/albums/k606/MoonBabe1213/IMAG0608.jpg
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi1118.photobucket.com%2Falbums%2Fk606%2FMoonBabe1213%2FIMAG0608.jpg&hash=21a8d2395c41984d59c97b5c94a7c9eed6ba81f2)