If you want to stay near the big city this would be a good RV camp area with a big park near by.
Great little area
RV only campsite near Oregon City. Campsite is right at the confluence of the Willamette and Clackamas Rivers. Self-contained RV sites very close to the water with bathroom facilities available in the daytime. Site is popular with ample fishing from the shoreline and you're only minutes away from downtown Portland.
The site for RVs is basically a big ugly parking lot, just off a busy street and near a McDonalds. The river and park around it, however, where the Willamette and Clackamas Rivers meet, is pretty cool. Great for looking for rocks. Went back a second time in the summer and was better than in winter.
Tents are not allowed here since all units must be "self contained." RV sites closer to the river/front row cost more ($25 vs $20). This is one of the closest RV sites to Portland, and not too expensive for a full RV site, so if you're looking for a spot to sleep near Portland and have an RV, this place wouldn't be too bad.