Portland moves up to seventh place in the Western Conference, while Colorado remains tied for third.
The Rapids opened the scoring in the 16th minute, when Drew Moor headed a corner kick that was saved by Donovan Ricketts. The rebound fell to Deshorn Brown, who had his first attempt also saved by Ricketts, but was able to muscle a second shot towards goal that managed to cross the line before Valeri could clear the ball. It was Brown's seventh goal of the season.
For much of the game, it looked like Colorado would make the lead hold up, but the Timbers finally managed to tie things up in the 72nd minute. A long sequence of passes by Portland eventually led to Jack Jewsbury pulling the ball back from the right wing to the substitute Urruti at the top of the 6-yard box, where the Portland forward blasted his seventh goal of the season into the roof of the net.
Five minutes later, Portland took the lead when Valeri blasted a 25-yard shot past a diving Clint Irwin and into the top corner of the net for his fourth goal of the season.
The victory ends a four-game winless streak for the Timbers, while also ending Colorado's three-game unbeaten streak.