The 33-year-old from Kimberley, B.C., raced to a time of one minute 24.19 seconds to win his second Paralympic medal after taking silver in the slalom four years ago in Vancouver.
Japan's Akira Kano won gold with a time of 1:23.80, while fellow countryman Takeski Suzuki was third in 1:24.75.
Calgary's Kurt Oatway was fifth in 1:25.46, while Caleb Brousseau of Terrace, B.C., was sixth in 1:25.62.
Earlier in the day, 16-year-old Mac Marcoux of Sault Ste. Marie, Ont., and his guide Robin Femy of Mont Tremblant, Que., won bronze in the men's visually impaired downhill race with a time of 1:23.02.
Spain's Yon Santacana Maiztegui was first in a time of 1:21.76, while Slovakia's Miroslav Haraus was second in 1:22.01.
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