Wintertime at Stevenson Bridge by Orin Zebest
Bridging two counties over the once volatile Putah Creek, this unique bridge is the rarest of public works: one which tolerates (or even accepts) graffiti. It's pretty special for that quality alone, but its setting makes it even more so.
It's also physically unique. To quote DavisWiki:
"The bridge was built in 1923 and has been identified by the state of California as eligible for the National Register of Historic Places. It's one of only three bridges in California that utilizes an architectural design known as the 'overhead tie arch.'"
It was an out-of-the-way trip, but utterly worth seeing. Sooner rather than later, I think: Yolo Country approved at 5 million dollar seismic rehabilitation in 2008. It aims to preserve the design of the bridge while bringing it up to modern standards. Even though some of the graffiti dates back to 1963, nowhere in the plan are any specifications on how it will be treated. I hope for the best, but the horribly mangled car wrecks under the bridge are already gone. Not a good sign.