This cache is a magnetic keybox with a logsheet in a baggie. Parking can be found near the structure in a pretty big pulloff area. Bring a pen to sign the log.
My wife found this bridge in her usual manner, so we had to go have a look. There are a couple of plaques, one at each end, explaining when the bridge was erected and why it was named. Happy Hunting! This should be a fairly easy find and another smiley for you!