Information for Strong-Motion Station
Eureka - Middle Channel Bridge
CGS - CSMIP Station 89735
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 40.8136 N
Longitude 124.1594 W
Elevation (m) --
Site Geology  
Vs30 (m/sec)  
Site Class  
No. of Spans9
Plan ShapeStraight
Total Length1082' (329.8m). Bridge spans range from 120' (36.6m) to 121' (36.9m) long.
Width of Deck34' (10.4m)
Construction Date1971
Instrumentation1996. 6 accelerometers on the bridge. 3 accelerometers at a free-field site.
Superstructure TypeConcrete I-girders supported on concrete bents and concrete seat abutments.
Substructure TypeHexagonal concrete columns. 1 column per bent.
Foundation TypeConcrete piles.
RemarksThis bridge was instrumented under the interagency agreement between Caltrans and DOC.