New construction of bridges often use “Weathering Steel” (also known as “Corten Steel”), which has a corrosion-retarding effect since the steel forms a protective rust layer on its surface under the influence of the weather. To date, no information exists on the high temperature mechanical properties of weathering steel. This research develops this knowledge for A588 weathering steel. The motivating event for this work was a bridge fire that occurred on October 3, 2012. A dump truck traveling south on the NJ Turnpike crashed and caught fire under a bridge that carries I-195 over the Turnpike (Figure 1). This bridge was being widened and had timber shielding beneath it, which provided some protection for the steel from the intense heat of the fire. It was decided to not pursue any repairs since the bridge that was subject to fire was scheduled to be demolished in a few weeks and an adjacent replacement bridge was nearly complete. Instead, one of the I195 west bound lanes was closed for precaution. This lane was reopened about a week later after a load test, with dump trucks, indicated that the fire-affected bridge had significant load capacity.