State Park in the Gorge near road
Ainsworth State Park is a gorgeous state park in the heart of the Gorge with great hikes and views of the Columbia river, all not far from Portland. The campsites, however, are located right next to the History Columbia River Highway, making for loud camping experience, though you are near all the great park activities. And when I say close, I mean you can see the highway from your tent.
Its location near Portland makes it very popular, and it is often full. Restrooms and showers available.