Chelsea Self / Post Independent A major rock and debris flow down the Devil’s Hole drainage in Glenwood Canyon last week was largely unexpected in terms of its impact on Interstate 70, state transportation officials said Wednesday. , damming the river and forcing it out of its channel up against the highway’s eastbound deck structure. as a result. Westbound lanes weren’t reopened until early Saturday morning, and the eastbound lanes remained closed until later that day. “The reason we didn’t open up the highway on Friday is because we didn’t know what the river was doing underneath the road itself,” Colorado Department of Transportation Region 3 Director Mike Goolsby said Wednesday during a media tour of the impacted area.