Pacific Northwest - Portland to coast solo ride?

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I'd like to do an unsupported ride from Hillsboro to the Coast. I know there are a few different routes, but I'm having some trouble with the logistics. I need a route suitable for a standard road bike (not set up for touring) but it appears like the most popular one via nestucca has 3 miles of gravel road. Can someone suggest an alternative?
The second issue is finding a ride back, but that's a seperate matter.
The reach the beach ride I believe does not go through gravel. Correct me if I'm mistaken people who have actually ridden it :P This map isn't going out of Hillsboro, but you could probably work out that route to connect to this one:
http://www.bikely.com/maps/bike-path/2008-Reach-the-Beach
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