Description by the NPS: "Distance, round trip:
4.8 miles (7.7 km)
Difficulty: easy
Trailhead: 3.5 miles (5.6 km) south of
Old Faithful Junction, just beyond parking for Kepler Cascades.
This pleasant, partially paved trail follows an old service road beside the
Firehole River to the geyser. Cyclists
must dismount at the end of the asphalt
and walk the last few hundred feet. Lone
Star erupts up to 45 feet (13.7 m) from
a 12-foot (3.6 m) cone approximately
every three hours."