From Seattle (145.98 miles, approx. 2 hrs 15 min.)

1. From I-5, take I-90 E toward Bellevue/Spokane for 141.3 miles
2. Take Exit 143, Silica Road
3. Turn left onto Silica Road SW and drive approximately 5.5 miles on Silica RD SW to the Cave B Driveway on left

From Spokane (140.02 miles, approx. 2 hours)

1. Take I-90 West for 135.6 miles
2. Take Exit 143, Silica Road
3. Turn right onto Silica Road SW
4. Drive approximately 5.5 miles on Silica RD SW to the Cave B Driveway on left

From Walla Walla (142.69 miles, approx. 3 hours)

1. Merge onto US-12 West and take for 45.2 miles
2. Take US-395 N Exit , Exit 14, towards Spokane for 22.9 miles
3. Take the WA-17 ramp toward Mesa/Moses Lake
4. Turn left onto WA-17/Pepiot Road and continue to follow WA17
5. Take the WA-26 ramp toward Othello/Vantage/US-395
6. Turn left onto WA-26 for 42.3 miles
7. Merge onto I-90 East
8. Take Exit 143, Silica Road
9. Turn left onto Silica Road SW and drive approximately 5.5 miles on Silica RD SW to the Cave B Driveway on left

Driving Map