FRESNO COUNTY, Calif. (KSEE/KGPE) – A tanker truck overturned on Highway 33 in Fresno County early Thursday morning, spilling about 1,000 gallons of fertilizer and forcing a full highway closure, according to the California Highway Patrol. CHP said officers responded around 6:12 a.m. to northbound Highway 33, just north of Manning Avenue, after receiving reports of an overturned truck tractor pulling a tanker trailer.