Colorado (10-19-4) won for the first time since Sept. 5 and guaranteed that it won't finish last in the Western Conference. Last-place Chivas (7-18-8) is winless in its last 12 games and has been shut out in six of its last seven.
Rivero opened the scoring in the 16th minute, converting a wide-open shot from close range for his second goal of the season. Tyson Wahl played the ball in from the left flank and Jaime Castrillon flicked a header to Rivero. Hill scored in the 40th minute on a header from 12 yards.
Goalkeeper Tim Melia made his MLS debut for Chivas. Dan Kennedy missed the game because of a knee injury, ending his streak of consecutive starts at 64.
(Copyright 2012 The Associated Press. All Rights Reserved)