CESMD |
Information for Strong-Motion Station |
Leggett - Big Dann Bridge |
CGS - CSMIP Station 79761 |
Earthquakes recorded by this station |
Latitude | 39.8471 N |
Longitude | 123.6967 W |
Elevation (m) | 275 |
Site Geology | |
Vs30 (m/sec) | |
Site Class |
No. of Spans | 7 |
Plan Shape | Straight. |
Total Length | 583' (177.7m). Bridge spans range from 39.5' (12.0m) to 51.5' (15.7m) long, with one 320' (97.5m) main span. |
Width of Deck | 28' (8.5m) |
Construction Date | 1933 |
Instrumentation | 1998. 9 accelerometers on the bridge. 3 accelerometers at a free-field site. |
Superstructure Type | Concrete T-girders simply supported on concrete piers. One end of each girder has an expansion joint. |
Substructure Type | Center span: concrete columns supported by concrete arch. Other spans: concrete columns. 2 columns per bent. |
Foundation Type | Spread footings. |
Remarks | This bridge was instrumented under the interagency agreement between Caltrans and DOC. A seismic safety gate is installed at the bridge. |