This can be a confusing area to navigate, especially if there are no tire tracks to follow. It is a large area with camping and a ton of different routes to take. It can get very crowded on weekends and holidays.
Get off Interstate 8 at Dunaway Road or Drew Road west of El Centro. Take S80 east to Huff Road. Follow Huff Road north about 6.3 miles. Reset odometer, turn left on Wheeler Road and stay on this wide dirt road as it heads west then northwest. After 4.8 miles, bear right heading almost north. You should see the information board near a fork at 7 miles.