Nice place, lots of amenities, reasonable rates.
Clean and generally friendly, the Jantzen Beach RV Park is right inside of Portland (at the northern end, close to Vancouver, Washington). It's more in an industrial/commercial area, with things like a Target Store across the street. The park is a combination of a true, more permanent trailer park on one side with more mobile RVs on the other (some looking like they'd been there longer than others). While there are definitely some RVs that were only the weekly or monthly plan, we didn't feel weird checking in for just a night since there were plenty of spots set up for people to come and go. The amenities however (like the pools) seemed like they were able to be used by everyone in both the RV and trailer park sides, so they were definitely busy but not too bad. I also had fun wandering around the trailer park since so many of the sites were from the 1950s or so and had a pretty awesome mid-century vibe going on.
While I thought the odd location in such an commercial area as well as the combination of trailer park and RV park was a little strange, my kiddos absolutely loved the three pools, playground, and basketball hoops. Plenty to check out and explore for them even if this was not your typical "campground" experience. Would definitely stay here for a night or so if I needed a place to stay within the Portland area again.
Large RV Park with lots of facilities including pools, playgrounds, several places for laundry, showers, a workout room etc. Feels more like a small village with a combination of a trailer park on one side, full-timer RVers in other places as well as spots for overnighters. On Hayden Island in Portland, so nearby to an outdoor mall that includes Target as well as several restaurants. Nice spots though some looked tight, lots of trees, and well maintained with many updates. Some full-time RV’ers had extra stuff around their sites. One drawback is that one side is on a busy road and you can hear traffic from nearby I-5 as well as airplanes flying overhead. Positive side, kids especially loved the pools and playground.