Directions

From Old Faithful, Yellowstone National Park

1. Head east on Pyramid Rd (0.2 mi)
2. Turn left onto Geyser View Ave (0.2 mi)
3. Geyser View Ave turns left and becomes Old Faithful Rd (0.6 mi)
4. Take the ramp to US-191 N/US-20 W/US-287 N/US-89 N (0.4 mi)
5. Keep right at the fork, follow signs for Madison and merge onto US-191 N/US-20 W/US-287 N/US-89 N
   Toll road
   Parts of this road may be closed at certain times or days
   (15.9 mi)
6. Turn left onto US-191 N/US-20 W/US-287 N
   Toll road
   Parts of this road may be closed at certain times or days
   Entering Montana
   (13.9 mi)
7. Turn right onto Boundary St (0.2 mi)
8. Turn left onto Firehole Ave (0.4 mi)
9. Continue onto US-20 W
   Entering Idaho
   (35.6 mi)
10. Turn left onto Mesa Falls Scenic Byway/Mesa Falls Trail/Old Hwy 47 Scenic
    Continue to follow Mesa Falls Scenic Byway
    (22.2 mi)
11. Turn left onto E 1400 Rd N/Cave Falls Rd
    Entering Wyoming
    (16.4 mi)
12. Turn left onto Bechler Ranger Station Rd
    Passing through Idaho
    Entering Wyoming
    (1.5 mi)
13. Turn right (259 ft)

You can begin at Old Faithful within the park or from the Bechler Ranger Station near Cave Falls. Either way, it's about a 15 mile hike. Near Ferris Fork 9D1, and where Gregg Fork, Ferris Fork, and Bechler River come together, you'll find a fork in the trail called 3 Rivers Junction. From there, you'll follow the trail East along Ferris Fork for 0.5 miles past the dangerous thermal feature until you see Mr. Bubbles pool set off the East side of the river. You'll be able to recognize it from the continuous bubbles coming up near the middle of the pool.