Tuesday, July 22, 2014

San Mateo County, California Bridges: Mountain Home Road Bridge across Bear Creek

July 2014 (37.42688 Degrees-122.25355 Degrees) Mountain Home Road Bridge
The bridges we are currently studying were all built near the town of Woodside in 1903 and are very similar. They're short concrete arches with wingwalls and barriers formed as extensions to the spandrel walls. Note the bags of hardened concrete used to protect the abutment foundations from scour. Similar to yesterday's King Mountain Road Bridge there is a timber walkway erected to carry equestrians due to the narrow bridge deck. The Mountain Home Road Bridge (35C0122) is also eligible for the National Register of Historic Places. There's a plaque next to the timber bridge to honor the late Dale Ryman, a former Caltrans engineer who built many equestrian bridges next to roadway bridges in the region (see photo below).
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San Mateo County, California Bridges: Mountain Home Road Bridge across Bear Creek by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Monday, July 21, 2014

San Mateo County, California Bridges: Kings Mountain Road Bridge across West Union Creek

July 2014 (37.43083 Degrees, -122.27583 Degrees) Kings Mountain Road Bridge
San Mateo County can be divided between bay, mountain, and coastal regions. We are leaving the coast for the mountains and some old mossy bridges. The Kings Mountain Road Bridge (35C0123) is a closed spandrel arch over West Union Creek. It was built in 1905 and it's eligible for the National Register of Historic Places. Among its features are massive barrier rails with handsome end posts and a timber walkway on its own supports along the south spandrel wall. 
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San Mateo County, California Bridges: Kings Mountain Road Bridge across West Union Creek by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.