An app will tell you a rest area dump station exists. It will not tell you the thing is closed today. Of the four state DOT sites we checked on August 15, 2026, two publish a dump station list at all, and only one of those publishes whether each station is currently working.
Washington publishes the status, and the status matters
WSDOT’s rest area list filters by amenity, and every entry carries two separate lines: the status of the rest area and the status of the dump station. On the first page of results we read, 16 rest areas listed an RV dumping station and 6 of those read “RV Dumping Station: Closed.”
Four of those 6 sat at rest areas that were themselves open: Scatter Creek northbound on I-5, Schrag eastbound on I-90, and Winchester in both directions on I-90. Silver Lake southbound on I-5 and Sprague Lake eastbound on I-90 were closed facilities entirely.
That is the whole lesson in one screen. The rest area being open tells you nothing about whether you can dump there. WSDOT also carries a filter for “RV Dumping Station Closed During Winter,” which is a different failure mode again.
Oregon publishes the list, not the status
ODOT’s TripCheck has a dedicated page naming six locations with RV sanitary dump stations: Charles Reynolds on I-84 east of La Grande, where the station is on the eastbound side only, plus Unity Lake, C.G. Washburne, William Tugman, Harris Beach and Clyde Holiday. Clyde Holiday on US 26 west of John Day is listed as open March through November, so it is available now and gone for the winter after that.
The page says these facilities “are available at no charge.” It does not publish a per-site open or closed status, so a phone call is still the only way to be certain on the day.
The two that publish nothing
Idaho’s rest area FAQ never mentions dump stations. It points you to the Roadside Programs Manager by phone. It does tell you something else worth knowing: “No camping, plugging vehicles, generators, or other camping devices into any outlets at rest areas; or hooking up hoses to water faucets.” So do not plan on topping off fresh water there either. See our Idaho rest area page for the rest of that rule set.
The Caltrans rest area page describes what its facilities are for and does not mention dump stations at all. That does not mean California rest areas have none. It means Caltrans does not publish the list, and we are not going to guess at one. Our California rest area page has what the state does publish.
How to work this
Check the state DOT rest area page before you plan the stop, not after. If it publishes a status, use it. If it publishes only a list, call ahead, because a list is a claim about last year. If it publishes nothing, treat the rest area as a maybe and put a real dump station on the route instead: agency and state park campgrounds publish their facilities on their own site pages.
The rest area layer is one category among several, and it is the one most likely to fail you on the day. Our dump stations and fresh water guide covers the other categories and what they cost, and the boondocking waste guide covers where the tank is legally allowed to go. That last part does not bend when the nearest station is closed. And the posted sign at the site beats any list, including this one.