Williamson Mountain, elevation 6253 feet (1,905.9 m),, is a peak in the Cascade Range

Cascade Range

The Cascade Range is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades...

 in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Oregon

Oregon

Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...

. It is named after Lt. Robert S. Williamson

Robert S. Williamson

Robert Stockton Williamson was an American soldier and engineer, noted for conducting surveys for the transcontinental railroad in California and Oregon.-Early life and career:...

, who with Lt. Philip Sheridan

Philip Sheridan

Philip Henry Sheridan was a career United States Army officer and a Union general in the American Civil War. His career was noted for his rapid rise to major general and his close association with Lt. Gen. Ulysses S...

 took part in the Pacific Railroad Surveys

Pacific Railroad Surveys

The Pacific Railroad Surveys -A series of explorations of the American West to explore possible routes for a transcontinental railroad across North America. The expeditions included surveyors, scientists, and artists and resulted in an immense body of data covering at least on the American West....

 in central Oregon in 1855. The United States Board on Geographic Names

United States Board on Geographic Names

The United States Board on Geographic Names is a United States federal body whose purpose is to establish and maintain uniform usage of geographic names throughout the U.S. government.-Overview:...

 approved the name in 1931. Before that, the peak was known by its Chinook Jargon

Chinook Jargon

Chinook Jargon originated as a pidgin trade language of the Pacific Northwest, and spread during the 19th century from the lower Columbia River, first to other areas in modern Oregon and Washington, then British Columbia and as far as Alaska, sometimes taking on characteristics of a creole language...

 name of Leloo Mountain (Wolf Mountain), derived from the French le loup (the wolf).

The mountain lies slightly east of the border between Lane County

Lane County, Oregon

-National protected areas:*Oregon Islands National Wildlife Refuge *Siuslaw National Forest *Umpqua National Forest *Willamette National Forest -Government:...

 and Deschutes County

Deschutes County, Oregon

-National protected areas:* Deschutes National Forest * Newberry National Volcanic Monument-Demographics:As of the census of 2000, there were 115,367 people, 45,595 households, and 31,962 families residing in the county. The population density was 38 people per square mile . There were 54,583...

 in the Deschutes National Forest

Deschutes National Forest

The Deschutes National Forest is a United States National Forest located in parts of Deschutes, Klamath, Lake, and Jefferson counties in central Oregon. It comprises 1.8 million acres along the east side of the Cascade mountains. In 1908, the Deschutes National Forest was established from parts...

 and the Three Sisters Wilderness

Three Sisters Wilderness

The Three Sisters Wilderness is a wilderness area in the Cascade Range, within the Willamette and Deschutes National Forests in Oregon. It comprises 286,708 acres , making it the second largest Wilderness area in Oregon...

, southwest of Mount Bachelor

Mount Bachelor

Mount Bachelor, formerly named Bachelor Butte, is a stratovolcano atop a shield volcano in the Cascade Volcanic Arc and the Cascade Range of central Oregon.The Mount Bachelor ski area has operated on the mountain since 1958....

. The Six Lakes Trail crosses the mountain between Lucky Lake to the southeast and Senoj Lake to the northwest. Forest Road 46 (Lava Lake Road) is about 2 miles (3.2 km) east of the mountain.