The Route 601 Bridge in Sugar Grove, Virginia, spans 11.89 m (39 ft) over Dickey Creek. The bridge is the first to use the Strongwell 91.4 cm (36 in.) deep fiber-reinforced polymer double web beam in a vehicular bridge superstructure. Construction of the new bridge was completed in October 2001 and field testing was undertaken shortly thereafter, as well as in June of 2002, to assess any potential changes in structural performance. This paper details the field evaluation of the Route 601 Bridge. Using midspan deflection and strain data from the October 2001 and June 2002 field tests, AASHTO bridge design parameters were determined—namely, wheel load distribution factor g , dynamic load allowance IM , and maximum deflection. The wheel load distribution factor was determined to be S∕4 , a dynamic load allowance was determined to be 0.36, and the maximum deflection of the bridge was L∕1,110 . Deflection results were lower than the AASHTO L∕800 limit. This discrepancy is attributed to partial composite action...