A 22 year-old man was treated for smoke inhalation after a semi fire that closed I-5 southbound between Kalama and Woodland for about a half-hour last night. The Sheriff’s Office says the fire was reported at about 8 pm near milepost 26, just north of the “supercurves.” By the time that crews from Cowlitz Fire District 5 in Kalama arrived, the truck was engulfed in flames. Witnesses reported that both fuel tanks on the truck exploded. No significant injuries were reported, but they did say that the one man needed treatment for smoke inhalation. The southbound freeway was completely closed until 8:37 pm; two lanes re-opened shortly after 9 pm, then all three lanes re-opened at about 10:15 pm. The cause of the fire is still under investigation.