Sentinel Gap, Water gap in Saddle Mountains, Washington State.
The Columbia River flows through a natural opening in the Saddle Mountains, creating a passage that extends across the mountain range.
During the Ice Age, powerful flood waters from glacial lakes carved through this section of the Saddle Mountains, establishing the current shape of Sentinel Gap.
Native American tribes utilized this natural passage through the mountains as a transportation route, connecting different regions of their territories.
State Route 243 provides vehicle access along the eastern side of the Columbia River through Sentinel Gap, with multiple pullouts for observation.
The basalt walls of Sentinel Gap display horizontal lines indicating water levels from ancient flood events that reached heights of several hundred feet.
GPS coordinates: 46.80528,-119.93389
Latest update: March 7, 2025 05:08
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