Texas · National Park trail

Lost Mine Trail Stop #25

in Texas

The white, yellow, and orange lichen on the rock pillars at this location consist of a fungus and an algae in a sumbiotic relationship. Because they absorb nutrients from rainwater, lichen are particularly vulnerable to air pollution. Sulfates, in particular - the predominant form of air pollution in the Big Bend region - kill the algae, so dead lichen are an early warning sign of harmful air pollution.

Studying lichen can tell us about the levels and types of air pollution. Look for more colorful lichen on the rocks and trees as you continue your hike.

States: Texas
Trail type: National Park trail
Centroid coords: 29.2707°, -103.2691°

About Big Bend National Park

National Park

This trail is inside Big Bend National Park, a national park managed by the U.S. National Park Service. Conditions, road status, trail closures, and reservation requirements are published on the park's NPS page — check it before driving in, especially in winter or during major weather events.

Entrance fee: $30 per vehicle (verify current rate on the park page). An America the Beautiful annual pass ($80) covers entrance to all NPS units.

Official NPS trail page: https://www.nps.gov/places/lost-mine-trail-stop-25.htm

Park homepage: https://www.nps.gov/bibe/index.htm

Plan your hike

Practical notes

Maps + permits: long-distance trails like this often require permits for through-hiking, backcountry camping, or specific sections (especially in National Parks). Check with the maintaining organisation listed above and the relevant land manager before booking travel.

Water + supplies: water sources vary seasonally on most U.S. trails. Carry a filter and consult current trail-condition reports — through-hiker journals (PCT-L, AT Reddit, etc.) and the maintaining organisation publish regular updates.

When to go: hiking seasons vary widely with elevation, latitude, and snowpack. Through-hikers traditionally start the AT in March-April (Springer northbound) and the PCT in late April (Campo northbound). High-elevation western trails (CDT, JMT, Wonderland) generally aren't passable until July.

If you've hiked Lost Mine Trail Stop #25 and have current notes (water sources, trail closures, permit changes), tell us at /contact — we update pages as we learn.