Three Oregon State Parks sites within about an hour or two of Portland list an RV dump station on their own park pages. We checked each page on 2026-10-28. The two Gorge parks, Ainsworth and Memaloose, post the standard state park terms: $10 per use, paid by QR code at the station, no camping reservation needed, and registered campers pay once per stay (fee details). Champoeg's page lists a dump station but doesn't post a fee, so we don't guess one.
| Park | Status from the park page | Source |
|---|---|---|
| Champoeg State Heritage Area Willamette River south of Newberg, about 25 miles from downtown Portland | Open year round for camping and day use. B Loop stays open all year; A Loop closes seasonally. Dump station listed in the campground amenities. Day-use parking permit required (1-day permit sold on site) Fee: Not posted | Oregon Parks and Recreation Department Park page verified 2026-10-28 |
| Ainsworth State Park Historic Columbia River Highway at the east end of the Waterfall Corridor, near I-84 and Multnomah Falls | SEASONAL: camping and day use Mar 21 to Oct 31; the park FAQ says the campground is closed Nov 1 through mid-March Fee: $10 per use (posted) | Oregon Parks and Recreation Department Park page verified 2026-10-28 |
| Memaloose State Park I-84 near Mosier, 11 miles west of The Dalles. Westbound only: take Exit 73 through the rest area. Eastbound, go to Exit 76, turn around, and come back west to Exit 73 | SEASONAL: camping and day use Apr 11 to Oct 31. RV dump station listed with the campground Fee: $10 per use (posted) | Oregon Parks and Recreation Department Park page verified 2026-10-28 |
Winter tip: both Gorge parks close after Oct 31, so from November to spring Champoeg is the one of the three that stays open. Its A Loop closes for the season, so check the park page or call 503-678-1251 before you go. For more cold-weather options see winter RV dumping. Memaloose sits next to I-84 and a rail line, and the Memaloose park page says there's no physical street address, so use the exit directions above rather than GPS.