- The 22.5 acre Lava Rivers Cave site was acquired by the Forest Service through an exchange of land with the State of Oregon in 1981. The area around the cave was originally donated to the State of Oregon for a park in 1926 by the Shevlin-Hixon Lumber Company.
- Lava River Cave is about 6200 feet long, as wide as 50 feet in places, and the ceiling is as much as 60 feet high in places.
- The Lava River Cave area has three ecosystems: the warm dry climate surrounding the entrance; the warm moist microclimate at the entrance; and the cool, moist, dark environment of the cave.
- At the point where Lava River Cave crosses beneath U.S. Hwy. 97 the roof of the cave is 50 feet thick.
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