LOGAN, Utah -- Donnel Pumphrey ran for 223 yards, moving into the top five on the NCAA career list, and Juwan Washington added 137 yards and two touchdowns in San Diego State's 40-13 victory over Utah State on Friday night.

John Baron II was perfect on a career high four field goals in the driving rain for the Aztecs (7-1, 4-0), who have won 15 straight over Mountain West Conference rivals.

Pumphrey leads the country with 1,469 yards this season. He passed Cedric Benson, Travis Prentice and Charles White as he reached 5,741.

Washington had scoring runs of 39 and 1 yards en route to his first 100-yard game and the Aztecs piled up 400 yards on the ground.

Malik Smith scored his first touchdown with a 28-yard return on his ninth career interception for the final Aztec score.

Kurt Myers passed for a score and ran for another for Utah State (3-7, 1-4). His first-quarter run marked the first time SDSU has trailed in a regular-season conference game since last Oct. 31, a span of 400 minutes, 14 seconds.