Eighteenmile Island is a 9.89 acre island on the Oregon side of the Columbia River at river mile 174 in Wasco County, Oregon, United States. It is about a half mile downstream of Mosier, Oregon and four miles upstream of Hood River. It can be seen from Interstate 84, which runs along the Oregon side of the Columbia River, and from the Historic Columbia River Highway. A small rocky "island" downstream of Eighteenmile Island houses a navigational light. The island is mentioned in the journal of Meriwether Lewis, from the Lewis and Clark Expedition.
The small island is located in the Columbia River Gorge region. It was mostly barren as of 2007, but features several douglas firs and willows, a basalt cliff, wildflowers, wild cherry trees, blackberry thickets, and a sandy beach. It is closer to the Oregon side of the river, and only a few hundred feet from its shoreline.
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