Information for Strong-Motion Station
Rio Dell - Hwy 101/Eel River Bridge
CGS - CSMIP Station 89973
Earthquakes recorded by this station
Ambient Records for CE89973
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 40.5093 N
Longitude 124.1196 W
Elevation (m) 13
Site Geology  
Vs30 (m/sec)  
Site Class  
No. of Spans8
Plan ShapeCurved.
Total Length1643' (500.8m). Bridge spans range from 68' (20.7m) to 303.5' (92.5m).
Width of Deck134.5' (41.0m) min.
Construction Date1941
Instrumentation2001. 15 accelerometers on the bridge. 3 accelerometers at a free-field site.
Superstructure Type2 prestressed concrete girder spans, 2 steel truss spans, and 4 concrete box girder spans. The truss spans are supported on isolators. Seat abutments.
Substructure TypeConcrete bent shafts. 1 column per bent
Foundation TypeSpread footings.
RemarksThis bridge was instrumented under the interagency agreement between Caltrans and DOC. The bridge was modified several times (1972, 1987, and 1989).