Pilot Knob (Imperial County, California)

Pilot Knob (also, Avie Quah-la-Altwa, Ha-bee-co-la-la, and San Pablo) is a peak in Imperial County, California.[2] Pilot Knob is located 8 miles (13 km) southeast of Ogilby,[3] It rises to an elevation of 876 feet (267 m).[1] Pilot Knob is a rocky landform, geologically a Volcanic plug, west of Yuma, Arizona–Winterhaven, California; it is connected to the Cargo Muchacho Mountains, the central portion of the mountains being about 7 miles (11 km) north. Pilot Knob was named for its prominence as a landmark for riverboat traffic in the 19th-20th centuries on the Colorado River which borders Winterhaven–Yuma. Pilot Knob is an Area of Critical Environmental Concern administered by the Bureau of Land Management.

Pilot Knob
(at center-left)
The Cargo Muchacho Mountains surrounded by alluvial fans. The small outlier "small mountain peak", due-south, is Pilot Knob.
(The line appearing adjacent, is the All American Canal to the El Centro agriculture region.)
Highest point
Elevation876 ft (267 m)  NAVD 88[1]
Coordinates32°43′54″N 114°45′00″W [1]
Geography
Pilot Knob
Pilot Knob
Pilot Knob (Arizona)
Pilot Knob
Pilot Knob (Baja California)
Topo mapUSGS Yuma West
Geology
Mountain typeVolcanic plug

Pilot Knob description

Separated from the center of the Cargo Muchacho Mountains by 7 mi, the volcanic landform is at the base of alluvial fans. Pilot Knob has a height of 897 feet (273 m), and the entire mountain block is about 2 x 2 mi. The mountain has a rock quarry on its north side, visible from Interstate 8.

Access to Pilot Knob

Pilot Knob is accessed from Interstate 8, the landform being east of the Algodones Dunes and east of El Centro, California in southeastern Imperial County. The All American Canal is cut from the south border of Pilot Knob, and can be seen in aerial views traversing the Algodones Dunes to the west.

History

When Juan Bautista de Anza sighted the peak in 1774 he named it Cerro de San Pablo.[3] The Saint Thomas Yuma Indian Mission was located 8 miles (13 km) to the east.[3] During the California Gold Rush, Pilot Knob was the landmark on the Southern Emigrant Trail for what was called Emigrant Crossing, the center crossing of three major crossings of the Colorado River in the vicinity of what is now Yuma, Arizona.[4] The Butterfield Overland Mail located its Pilot Knob Station, near the river and the Knob in 1858.

The Alamo Canal intake was placed at Pilot Knob due to the availability of a solid rock foundation for the head gate.[5]

KIVA (TV) Yuma, Arizona transmitted from Pilot Knob from 1953 to 1970.

gollark: Hmm. Well. Extended monitoring mode would probably not help.
gollark: Nope. Nothing.
gollark: I'll check the IR logs.
gollark: It's probably trying to kill-process itself.
gollark: Well, if you run them in the sandbox that won't work.

References
  1. "West Pilot". NGS data sheet. U.S. National Geodetic Survey. Retrieved 2009-08-16.
  2. "Pilot Knob". Geographic Names Information System. United States Geological Survey. Retrieved 2009-08-16.
  3. Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Clovis, Calif.: Word Dancer Press. p. 1455. ISBN 1-884995-14-4.
  4. Janet L. Hargett, Pioneering At Yuma Crossing: The Business Career of L. J. F. Jaeger, 1850-1887, Arizona And The West, Vol. 25, No. 4 (Winter, 1983), p. 334 (map)
  5. Clarence Everett Tait (1908). Irrigation in Imperial Valley, California: its problems and possibilities. Washington Government Printing Office. p. 51. ISBN 978-1-113-10178-5. Retrieved 26 August 2010.
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