Trailing 1-0 in the second half, Vancouver (9-7-6) got the equalizer when defender Harvey got his head on a Camilo Sanvezzo corner kick that eluded Portland goalkeeper Donovan Ricketts.
The Whitecaps, playing in game that saw a total of six yellow cards issued, lost midfielder Brad Rusin to a sprained right ankle after he got into a battle with Portland counterpart Diego Valeri.
Vancouver held onto the fifth and final Western Conference playoff spot at 33 points with the result.
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