Following the senior sides 2-1 win over the Whitecaps on Saturday night, the spirit of the Timbers shone through with more than 10,000 showing their support.
MLS officials believe it is a reserve league record attendance since the league commenced 16 years ago and Timbers chief operating officer Mike Golub explained the reason why there was such as good turnout.
"A lot of people can't get tickets to see the Timbers so we've seen increasingly large crowds at reserve games," Golub said. "It's a great option for fans because many first-team players often show up at these games.
"We knew we had a really strong fan base but we've been just astounded by the outpouring of support," Golub added. "We've really tapped into something here."
And Golub says the Timbers support it is not about to stop at reserve match attendances.
"We think we'll break the record for sponsorship revenue of any expansion MLS team," he added further.
"This in a market that's one of the smallest in the league. It has been awesome."