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Moses Lake Sand Dunes

Thursday, February 8, 2024

Other Names

Grant County ORV Area, Potholes Reservoir, Mud Flats

Last Known StatusOpen

About 3,000 acres of year-round rolling inland sand dunes are available here for motorized use. Adjacent to the sand dunes is an area called the Mud Flats, which is an additional 3,000 acres of sand, mud and trails to explore but is only open from July 1 through October 1.

Camping is permitted but there are no services except for a vault toilet, so bring your own shade and water. Direct access to the lake makes this a choice spot so you can bring along the water toys too. Note that the dunes are covered with volcanic ash and tend to be little dusty.

A paddle tire is not required but new riders may want to bring something like a Sand Snake paddle tire for motorcycles or Sedona Cyclones sand tires for ATVs. Failure to use a sand tire in deep sand can sometimes result in unnecessary wear or damage to your vehicle.

Dune Area Map... Nearby ATV Dune Areas...


Permit RequiredYesWA ORV Tab
Dates OpenYear-Round
Other ATV Stickers AcceptedUnknown
Spark ArrestorYesA spark arresting exhaust silencer or end cap is required for all vehicles.
Noise LimitYes (105 dB)
Whip FlagsYes (108 inches)Whip Flags Required For Safety
Maximum Vehicle WidthNo Restriction
Allow Dirt Bikes, Trail Bikes and Motorcycles Motorcycles & Dirt BikesPermitted
Allow All Terrain Vehicles / Quads / Four Wheelers ATVsPermitted
Allow Utility Terrain Vehicles, Side by Sides (SXS), RZR UTV & SXSPermitted
Allow 4x4 Jeeps, SUVs and 4 x 4 Trucks with License Plates 4x4 & Jeeps (registered)Permitted
Dune Buggy & Sand Rail
4x4 (unregistered)
2 Stroke EnginesNo Restriction
MX Helmet RequiredYes
Camping / Overnight RV Parking CampingNo Restriction(camp anywhere)
camping restricted during three day holiday weekends
Campfire Restrictions CampfiresNo Restrictionsmall fires permitted - no wood pallets or anything with nails
Night RidingUnknown
Trail BlazingPermitted
Rule EnforcementStrictDedicated Rangers/Officers
Jeep/SUV Patrol
ATV/Saddle Mounted Patrol


Approx Size3,000 acres (5 sq mi)
Climate TypeInland Dunes
Elevation1000 to 1100 ft.
Trail MaintenanceUnknown
Loose DirtThis dune area has no loose dirt.None
Hard PackThe dune area has little hard pack terrain.Little
SandThis dune area has mostly sandy areas.Mostlypaddle or sand tire recommended for best experience
MudThe dune area has no mud after it rains.None
DustThe dune area has no dust on typical days.None
RocksThis dune area has no rocks.None
TreesThe dune area has no trees.None
Steep HillsThis dune area has some steep hills.Some
Water CrossingsThe dune area has no water crossings.None
Small JumpsThis dune area has some small jumps.Some
Large JumpsThis dune area has some large jumps.Some
BermsThe dune area has no berms.None
Single TrackThis county land has no single track trails.None
RoadsThis county land has no roads.None
ShadeThis county land has no shaded areas.None
HazardsThis dune area has few hazards.Few(hazards assumed marked but use caution)
Easy Terrain NoviceThis dune area has little beginner terrain.Little
Moderate Terrain AmateurThis dune area has some intermediate level terrain.Some
Difficult Terrain ExpertThis dune area has no expert terrain.None


AreaOff-Road Dunes
LandCounty Land


Gasoline Gasoline5-20 Miles (N)Exxon (509) 765-1873
Diesel Diesel5-20 Miles (N)Exxon (509) 765-1873
Potable Water Water5-20 Miles (N)Exxon (509) 765-1873
RV Hookups RV Hookup5-20 Miles (N)Desert Oasis RV Park (509) 764-5319
RV Dump Station RV Disposal5-20 Miles (N)Desert Oasis RV Park (509) 764-5319
Primitive Camping Campground5-20 Miles (SW)Potholes State Park Campground (360) 902-8844
Convenience Store Conv Store5-20 Miles (NE)Moses Lake Market (509) 765-0888




Our RatingRatingGood
Recommended StayFull Day
Comments(Scroll Down For Rider Reviews & Comments)


Nearest CityMoses Lake, WA
AddressSand Dune Road, Moses Lake, WA 98837
Go Back To Washington List
Dune MapGo To Dune Map
From: Spokane, WA
1) Take I-90 West to Exit 174
2) Turn left (south) off the exit ramp, continue .2 miles
3) Turn left (east) at the T-intersection, continue .4 miles
4) Turn right (south) onto Sand Dune Road, continue about 4 miles toward the dunes.


Contact InfoGrant County Sheriffs Office - ORV Program
P.O. Box 37
Ephrata, WA 98823
(509) 760-2274
Contact InfoWashington State Department of Licensing
(360) 902-3770
CommentWA ORV Tab Info


Moses Lake Dune Area Photo

Moses Lake Sand Dunes Dune Area

Photo Submitted 10/30/2011 (Thanks!)

Moses Lake Dune Area Photo

Young woman sitting on Yamaha Raptor 700R parked next to HOnda dirt bike with orange whip flag.

Photo Submitted 02/28/2013 (Thanks!)

Moses Lake Dune Area Photo

Two ATVs with orange whip flags parked next to box trailer with young woman nearby.

Photo Submitted 02/28/2013 (Thanks!)

Moses Lake Dune Area Photo

Kawasaki ATV with rear sand paddle and front sand tires catching some big air at the dunes.

Photo Submitted 1/29/2013 (Thanks!)

Moses Lake Dune Area Photo

Honda ATV with rider jumping a big dune.

Photo Submitted 2/28/2014 (Thanks!)

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