The Portland Economic Development agency talks about planning an innovation district but the pages referred to in the text at the bottom of the page are "not available."
And here is a sketchy blurry PDF version of a proposal. One blogger spoke of voting it down in 2011.
It could be the case in Portland, like Boulder, that because their universities are some of the most interdisciplinary in the nation, they already has a highly effectively, highly networked entrepreneurship ecosystem.
As a researcher on a study conducted in 2012 by Shirley Vincent at NCSE in Washington DC I found Oregon State University to be the most interdisciplinary (a sign of advanced networking and collaboration skills). University of Oregon has a similar bent.