Lenhart tallied off a header pass from Alan Gordon and fired it over the outstretched hands of Rapids goalkeeper Clint Irwin to give San Jose (4-6-6) a lead in its first game under new Coach Mark Watson.
Sam Cronin doubled the advantage in the 52nd when he collected Rafael Baca's through ball and scored on a breakaway.
The Rapids (5-5-5) got a goal on a Nathan Sturgis header in the 67th despite being a man down after Atiba Harris was handed a red card for a violent tackle on Alan Gordon in the 18th minute.
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