Information for Strong-Motion Station
Vallejo - Hwy 37/Napa River Bridge
CGS - CSMIP Station 68065
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 38.1205 N
Longitude 122.2801 W
Elevation (m) --
Site Geology  
Vs30 (m/sec)  
Site Class  
No. of Spans28
Plan ShapeStraight.
Total Length3280' (999.7m). Bridge spans range from 30' (9.1m) to 188' (57.3m).
Width of Deck66.7' (20.3m) min.
Construction Date1967
Instrumentation2001. 12 accelerometers on the bridge. 3 accelerometers at a free-field site.
Superstructure TypeConcrete slabs on prestressed concrete girders.
Substructure TypeConcrete column towers and piers. 2 or 3 columns per pier; 4 columns per tower. Seismic strengthening includes column retrofit (full-height steel shell), cap and diaphragm retrofit, and foundation retrofit.
Foundation TypeAbutment 1 through Pier 23 on concrete piles. Pier 24 through Abutment 26 on spread footings.
RemarksThis bridge was instrumented under the interagency agreement between Caltrans and DOC. The bridge was retrofit in 1984, 1990, and 1997.