From I-90: Exit 221 to Hwy 261 south to Washtucna. Traveling south and west on both Hwy 260 & 261 approximately 6 miles, turn left (south) on Hwy 261. Go 15 miles, cross Snake River on Vantage Bridge, entrance on right. From Hwy 12: Turn north near mile marker 382 onto Hwy 261. Go 15 miles north. Entrance on left.