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Loudon topographic map
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About this map
Name: Loudon topographic map, elevation, terrain.
Location: Loudon, Multnomah County, Oregon, 97019, United States (45.48477 -122.25974 45.52477 -122.21974)
Average elevation: 277 m
Minimum elevation: 77 m
Maximum elevation: 411 m
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Solidified lava from Grande Ronde members of the Columbia River Basalt Group underlie Forest Park. About 16 million years ago during the Middle Miocene, the Columbia River ran through a lowland south of its modern channel. Eruptions from linear vents in eastern Oregon and Washington flowed down this channel…
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