Alvarado lost her World Cup lead in final-lap crash, Aerts secures overall with second-place in the race.
Fans hoping to watch Saturday's UCI Cyclocross World Cup opener in Iowa can stream it live on velonews.com
Dutch champion puts on a display of power and faultless skill before next weekend's world championships.
European champion van der Poel continues his remarkable win streak. Youngster Nieuwenhuis earns first elite World Cup podium.
Van der Poel attacked on lap three and showed no sign of weakness as Vanthourenhout and Van der Haar battled for second