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The John Day River passing by Sheep Rock in the John Day Fossil Beds National Monument. The John Day River is a tributary of the Columbia River, approximately 284 miles (457 km) long, in northeastern Oregon in the United States. It is known as the Mah-Hah River by the Cayuse people. Undammed along its entire length, the river is the fourth ...
The Middle Fork John Day River is a 73-mile (117 km) tributary of the North Fork John Day River in the U.S. state of Oregon.It originates in the Blue Mountains of northeast Oregon in the Malheur National Forest near Austin and flows generally west to the North Fork about 18 miles (29 km) above Monument.
The John Day Formation is a series of rock strata exposed in the Picture Gorge district of the John Day River basin and elsewhere in north-central Oregon in the United States. The Picture Gorge exposure lies east of the Blue Mountain uplift, which cuts southwest–northeast through the Horse Heaven mining district northeast of Madras .
The John Day River is a tributary of the Columbia River, approximately 6 miles (10 km) long, in northwestern Oregon in the United States. The river rises in the Northern Oregon Coast Range in Clatsop County [ 4 ] at 46°08′20″N 123°42′17″W / 46.138889°N 123.704722°W / 46.138889; -123.704722 ( John Day River
The upper reaches of the river flow through the North Fork John Day Wilderness in the Wallowa–Whitman National Forest and the Umatilla National Forest. From its headwaters to its confluence with Camas Creek, the river is part of the National Wild and Scenic River system under the Wild and Scenic Rivers Act of 1968. The upper 27.8 miles (44.7 ...
The South Fork John Day River is a 60-mile (97 km) tributary of the John Day River in the U.S. state of Oregon.It begins in the Malheur National Forest in Harney County about 25 miles (40 km) north-northwest of Burns and flows generally north to Dayville, where it meets the main stem of the John Day River.
John Day Fossil Beds National Monument is a U.S. national monument in Wheeler and Grant counties in east-central Oregon.Located within the John Day River basin and managed by the National Park Service, the park is known for its well-preserved layers of fossil plants and mammals that lived in the region between the late Eocene, about 45 million years ago, and the late Miocene, about 5 million ...
Rock Creek is an 82-mile (132 km) tributary of the John Day River in the U.S. state of Oregon. The source of the creek is at an elevation of 4,351 feet (1,326 m) in the Umatilla National Forest, while the mouth is at an elevation of 404 feet (123 m) east of Wasco. Rock Creek has a 507-square-mile (1,310 km 2) watershed. [1] [3] [4]