John Day, river, 281 mi (452 km) long, rising in several branches in the Strawberry Mts., NE Oreg., and flowing W, then N to the Columbia River. Unnavigable, the river is used to irrigate vegetable farms. Within the river valley is the
John Day Fossil Beds National Monument, containing well-preserved fossils of plants and animals as well as the striking Painted Hills and the cliffs of the Clarno Palisades (see National Parks and Monuments, table).
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
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