Information for Strong-Motion Station
Novato - Hwy37/Petaluma River Bridge
CGS - CSMIP Station 68778
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 38.1157 N
Longitude 122.5054 W
Elevation (m) --
Site Geology Alluvium
Vs30 (m/sec) 259 (inferred)
Site Class D
Remarks/Notes Site information sources
No. of Spans29
Plan ShapeStraight.
Total Length2183' (665.4m). Bridge spans range from 25' (7.6m) to 160' (48.8m).
Width of Deck67.25' (20.5m)
Construction Date1958
Instrumentation1999. 9 accelerometers on the bridge. 3 accelerometers at a free-field site.
Superstructure TypeChannel span: Concrete deck on eight welded steel girders. Other spans: Concrete deck on eleven prestressed T-girders. 4 intermediate expansion joints.
Substructure TypeCircular concrete columns interconnected with rectangular concrete struts. Columns and struts were seismically stengthened with steel casing during the retrofit. 2 columns per bent.
Foundation TypeBents 6 to 29 and Abutment 30 are supported on concrete piles. Bents 2 to 5 are supported on spread footings. Abutment 1 is supported on steel H-piles.
RemarksThis bridge was instrumented under the interagency agreement between Caltrans and DOC. The bridge was retrofitted in 1997.