At Approx. 7:21 Tuesday evening Portland Firefighters responded to reports of a commercial fire at North Columbia Blvd. and Vancouver.

On arrival firefighters found a bridge over the Columbia Slough with fire underneath. The fire had burned some brush and damaged a homeless camp that was located beneath the bridge.

Firefighters brought the fire under control however some of the bridges wooden structural members and a power line where damaged.

Fire officials are working to determine who owns the bridge so that the structure can be evaluated for safety. The bridge will remain closed to vehicle traffic until the safety of the damaged components can be evaluated.

Fire investigators have yet to determine a cause.