Doherty Slide, Protected area in Lake County, Oregon.
Oregon Route 140 crosses the Doherty Slide, a volcanic rim rising 1000 feet above the valley floor in southeastern Oregon near the Nevada border.
The geological formation emerged through lava extrusions that created a ridge, which erosion processes subsequently shaped into the current rim structure.
The Doherty Slide represents a testament to road engineering, where a highway navigates through severe geological constraints in the American West.
Drivers must exercise caution on the narrow two-lane road with an 8 percent grade that extends for three miles without guard rails.
The eastern side of Doherty Slide connects to a plateau stretching across southeastern Oregon, while the western face presents a sharp descent into Guano Valley.
Location: Oregon
GPS coordinates: 42.03680,-119.48300
Latest update: October 28, 2025 11:24
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