One destination, several boundaries
The route in is easy. The boundaries are not, because two seasonal zones run on opposite calendars and one holiday rule is drawn against a building rather than a map line.
The working trip map
Every marker identifies the exact planning point and updates the matching detail card. Approximate orientation pins are labeled; official boundaries still control.
No cell service needed Camp Compass
Getting turned around on an open dune is ordinary, not careless. Every rise looks like the last one, tracks fill in, and the rig you parked beside disappears the moment you drop over a crest.
Camp Compass does three things. It marks your camp so you can find it again, it points you back to it using GPS, and it shares your coordinates by text if you need help. The first two work with no cell service at all. Sending needs either cell coverage or a phone with satellite messaging.
This works without cell service. The satellite receiver in your phone listens to GPS and does not need a carrier or a signal bar. Marking camp, reading your position, and getting the direction and distance back all run on the device. Sending a message or opening driving directions are the only parts that need to reach out.
Signal here is usually fine, but do not bet the trip on it. The city has full coverage and the ORV area is only about four miles out. Nobody publishes coverage for the dune bowls themselves, and a low spot is a low spot.
The arrow is a straight line, not a route. It points at the coordinates you saved. It does not know about a wash, a fence, a closed area, or a dune face you cannot climb. Use it to orient yourself, then pick a way that works.
Nothing is sent anywhere on its own. The saved spot is stored on this phone only. Sharing is the one thing here that needs to reach the outside world, by cell coverage or satellite messaging. A text will often get through on one bar when data will not.
Open driving directions back (needs signal)How Camp Compass works, and why GPS needs no cell signal →
The ORV area sits about four miles south of the Moses Lake city limits, on Potatoe Hill Road. Take Division Street south, or come off I-90 at exit 174 and follow the signs south. It is close enough to town that you can forget something and recover, which is unusual for a dune destination and worth taking advantage of.
Grant County states that ATVs, UTVs, and motorcycles are not allowed on county roadways unless specifically authorized by law. An open ORV area does not make the roads around it legal to ride. Haul the machines the last four miles rather than assuming the rule bends near the entrance.
The Yellow Zone is closed October 1 through June 30. The Mud Flats are open July 1 through October 1. Those windows barely overlap, so the ground available to you depends entirely on the date you arrive. Map both before planning any mileage, because a pin cannot tell you whether a zone is open today.
On Memorial Day, Fourth of July, and Labor Day weekends, camping is prohibited west of the third restroom building to the intersection of Sand Dunes Road and Powerline Road. That corridor stays clear for emergency access. It is an unusual way to describe a boundary and it is the one that catches returning visitors, because the rest of the year camping is allowed almost anywhere.
The riding area sits on ground between Moses Lake to the north and the top of Potholes Reservoir to the south. No official source establishes a designated public swimming area or permission to ride a machine down to the water, and reports of a motorized setback from the shoreline circulate without an official map behind them. Treat the shoreline as a boundary to stay back from rather than a destination.
Save camp coordinates and share them with every driver and rider before the first machine moves, along with regroup points and an exit route. Cell service may work near town and the main access corridor, but do not build an emergency plan that depends on a signal.
The interactive map here is for planning: arrival, camping context, services, and the seasonal zones as approximate markers. Grant County's current information is what controls access, closures, and boundaries. Where they differ, the county is right. Save both offline before you leave town.
Verify before travel. Conditions, zones, and regulations can change. Use the responsible agency's current information for final decisions.
Open Grant County's official source →