Oct 31, 2015; Fort Collins, CO, USA; San Diego State Aztecs running back Donnel Pumphrey (19) runs past Colorado State Rams defensive back Kevin Pierre-Louis (26) after a reception for a thirty two yard touchdown in the third quarter at Sonny Lubick Field at Hughes Stadium.

Ron Chenoy USA TODAY Sports

FORT COLLINS, Colo. (AP) -- Donnel Pumphrey rushed for two touchdowns and caught a third as San Diego State ran its winning streak to five games with a 41-17 victory over Colorado State on Saturday.

The Aztecs (6-3, 5-0 Mountain West) reached 5-0 in conference for the first time since becoming a Division I team in 1969.

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Colorado State (3-5, 1-3) stayed close, trailing 13-10 at the break. San Diego State scored four touchdowns after halftime, including a 55-yard interception return by Damontae Kazee for his first career touchdown.

Pumphrey rushed for 121 yards on 20 carries, breaking 100 yards for the fifth straight game, and surpassing 1,000 yards for the season. He scored from the 1 in the first quarter, and added a 64-yard run in the final quarter.

The Rams tied it when Nick Stevens found Rashad Higgins from the 35, and went ahead 10-7 on Wyatt Bryan's 44-yard field goal.