The Four Bridges of Dublin Canyon
I did some exploration last weekend in Dublin Canyon to identify what remains of the Lincoln Highway in the area.
Starting at San Ramon Rd and Dublin Blvd.
West 0.3 miles and turn left into the Hexcel parking lot
This short segment ends at the gated parking lot behind it. Behind the parking lot is I-580. This section would have been bypassed when the road was straightened for US 50. Notice the handsome vehicle on the right? That is "Rocinante." Bonus points if you can name at least 3 literary references where the name comes from.

Backtracking to San Ramon road, and turn right (south). Right turn on Dublin Canyon Road and reset the odomoter. At 0.5 miles is the first bridge. This is also the point that meets up with the roadway that was covered by the interstate.
This photo is looking back towards the spot of the first picture. The Interstate is the large berm where the road curves. The LH would have been straight at this point.

The bridge looking west. The road has been widened after the bridge to accomodate housing developments in the hills.

Close up of the Lincoln Highway marker

The construction of the culvert is quite substantial. They were built to last. Notice the drop in the creek bed. The creekbed under the culvert was also paved and the creekbed has dropped over time.

Continuing West to the 0.9 mile mark we reach the second bridge. Construction of the culvert was the same as the first bridge.

Detail of the LH marker on the second bridge

At approximately the 1.4 mile mark we reach roadbed that was constructed at the same time as the Interstate.

At 4.9 miles we reach Paloverde and turn left off of Dublin Canyon
At 5.3 miles we reach the barn that started this posting. The barn was built with round nails. On Paloverde there are a couple of old houses on the right side that may date back to the Lincoln period. Is it possible one could have been an Inn in a previous life? Unfortunately I did not have enough time to do a door to door inquiry.
At 5.7 miles Paloverde rejoins with Castro Valley Blvd.
At 6.2 miles we reach the point where East Castro Valley Blvd passes under I-580. This was the mileage point identified as the spot of the Dublin Canyon Inn.
I continued west on East Castro Valley Blvd and turned left on Five Canyons Parkway and left again on Old Dublin Rd. At the end of Old Dublin Road (Fraga) is the bridge in the photo below. Construction is very similar to the previous two bridges.

The hidden surprise is what was 75 yards north of the bridge. Up the creek and higher up the hill was another culvert. There were railings on the downhill side as if it once was roadbed but now had a couple of feet worth of dirt over top. There was a hill behind it and the Interstate on the other side. All of this is hidden on Google Earth by a grove of eucalyptus trees. Hiking around cleared my sinuses. Some of the area was private property which did limit my exploration to the creek and roadbed.
When I got home I looked on a 1949 topo map and it did show that a road was put in that cut off the lower bridge. Why is hard to tell but the culvert goes back into the hill significantly. I walked until I ran out of light and still could not see the light at the end of the tunnel. There were no dates to be found on any of the bridges I found.