A new paper on the collapse of a span in the I-5 Skagit River Bridge, which occurred due to a vehicle strike, is now available in the ASCE Journal of Performance of Constructed Facilities:
Stark, T., Benekohal, R., Fahnestock, L., LaFave, J., He, J., and Wittenkeller, C. (2016). “I-5 Skagit River Bridge Collapse Review.” J. Perform. Constr. Facil. , 10.1061/(ASCE)CF.1943-5509.0000913, 04016061.