EWDRA wanted to populate this page with information about places to ride within 3 hours of the Tri-Cities. Shoot the webmaster an email (ag.miskho@frontier.com) with the following information on what you know regarding places open to the public!
Name:
Location:
Camping style: Dry, hookups, showers, toilets, etc
Directions:
Terrain type:
What bikes can ride: 2-wheel, 4-wheel
Fees:
Website link: 

Thanks Tony (webmaster) 

WOHVA Where To Ride

Juniper Dunes

Location:  ~15 miles Northeast of Pasco WA,

Camping Style:  Dry

Directions:  From Pasco, take highway 12 south and exit at the Kahlotus Hwy turnoff and travel east to Peterson Road (where the crop duster parking is) and turn left.  Travel north on the gravel road for a few miles.  Smith Canyon is a turn off on the right.  Main parking is further in on the main road.

Terrrain type:  easy to medium sand riding

Terrain Syle:  Dunes, sand trails for both 2 wheels and 4 wheels

Fees:  None, however special flag rules apply to take a flag.  See BLM webpage

Spokane, WA BLM Juniper Website

Name: Little Naches
Location: Cascade mountains, Chinook Pass
Camping style: Dry in most areas, toilets in paid areas
Directions: From Yakima, take highway 12 to White Pass/Chinook Pass. Stay on 12 to Chinook Pass, drive about 20-25 miles, go past Whistlin Jack's lodge, continue for 4-5 miles, and turn right off the road where the sign says "Little Naches."
Terrain type: Easy to medium. Easy on the lower trails, and medium difficulty in the moutains
Terrain Style: mostly 2-wheel. A little 4-wheel and a little jeep
Fees: The places with the toilets are $7.00 per night for a campsite with a fire pit and a table (Kaner Flats, Crow Creek). Other areas are free.

Little Naches US Forest Service webpage

Name: Ukiah (Winom-Frazier)
Location: North East Oregon
Camping style: Dry
Directions: see link
Terrain type: see link
What bikes can ride: see link
Fees: $5 per night at Frazier

Ukiah Winom-Frazier Map

Ukiah Winom-Frazier information

Name: Cle Elum Ranger District: Icewater Campground, Manastash campground, Riders Campground, Taneum Junction, Liberty-Williams Creek
Location: Cascade mountains, near snoqualimie pass
Camping style: see links
Directions: see links
Terrain type: see links
What bikes can ride: see links
Fees: see links

Cle Elum ranger district riding places

Name: Morrow County OHV Park
Location: Oregon, near Happner
Camping style: Some dry, some wet, staffed by county personnel
Directions: lee links
Terrain type: Easy trails
What bikes can ride: 2-wheel and 4-wheel

Morrow County OHV Park

Name: Moses Lake Sand Dunes/ORV Park
Enjoy the fun and excitement of "conquering" a sand dune and more! The Grant County ORV area (one of the largest in the region) is located just four miles outside Moses Lake city limits in the sand dunes. Drive south on Division Street or take exit 174 off of I-90 and follow signs south. Rustic (no developed facilities) camping is permitted. The sand dunes area is located on the southern tip of Moses Lake with rolling sand dunes and great fishing and waterskiing opportunities available. Check with the Grant County Sheriff's departments' for rules and regulations.

Straddleline ORV - Grays Harbor County WA (old Thurston County ORV) (currently closed)