Mile 179 - Lava Falls
Between 800,000 and 100,000 years ago, eruptions from the Uinkaret Lava Field spilled volcanic material into the canyon subsequently forming at least 13 distinct dams at different times and locations from River Mile 178 to River Mile 254. The dams ranged in height from 800 to 1400 feet high. The river backed up forming lakes behind these lava plugs, but eventually carved pathways around them. Lava Flows that cascaded into the canyon before solidifying are distinctly visible beginning in the approach to Lava Falls, and then continuing downstream for several miles.