CESMD |
Information for Strong-Motion Station |
Half Moon Bay - Hwy 1/Tunitas Cr. Bridge |
CGS - CSMIP Station 58754 |
Earthquakes recorded by this station |
Latitude | 37.3574 N |
Longitude | 122.3970 W |
Elevation (m) | 16 |
Site Geology | |
Vs30 (m/sec) | |
Site Class |
No. of Spans | 6 |
Plan Shape | Curved with skew. |
Total Length | 420.5' (128.2m). Bridge spans range from 65' (19.8m) to 75' (22.9m) long. |
Width of Deck | 34' (10.4m) |
Construction Date | 1962 |
Instrumentation | 1997. 6 accelerometers on the bridge. 3 accelerometers at a free-field site. |
Superstructure Type | Prestressed concrete I-girders. Diaphragm abutments. |
Substructure Type | Rectangular concrete columns (retrofitted with steel jackets). 1 column per bent. |
Foundation Type | The taller bents (Bents 3 and 4) are on spread footings. Other bents and abutments are on steel piles. |
Remarks | This bridge was instrumented under the interagency agreement between Caltrans and DOC. The bridge was retrofitted in 1994. |