|Los Gatos Creek|
|Arroyo de Los Gatos, Jones Creek|
Upper Los Gatos Creek confluence with Lexington Reservoir, courtesy Mercury Freedom 2008
|Region||Santa Clara County|
|- left||Moody Gulch, Aldercroft Creek, Briggs Creek, Black Creek, Lyndon Canyon Creek|
|- right||Austrian Gulch, Hooker Gulch Creek, Hendrys Creek, Soda Springs Creek, Limekiln Canyon Creek, Dry Creek|
|Cities||Los Gatos, Monte Sereno, Campbell, San Jose, Holy City, Chemeketa Park|
|Source||Loma Prieta Mountain in the Santa Cruz Mountains|
|- elevation||3,250 ft (991 m)|
|- location||San Jose, California|
|- elevation||69 ft (21 m) |
The Los Gatos Creek runs 24 miles in California through Santa Clara Valley Water District's Guadalupe Watershed from the Santa Cruz Mountains northward through the Santa Clara Valley until its confluence with the Guadalupe River in downtown San Jose. The Guadalupe River then continues onward into San Francisco Bay.
The creek begins in the Santa Cruz mountains near the Santa Clara/Santa Cruz County border, just south of the peak Loma Prieta. It then flows northwesterly to Lake Elsman, a reservoir owned by the San Jose Water Company, then on to Holy City and Chemeketa Park, then northward into the Lexington Reservoir. The creek then flows through the Los Gatos Canyon and through the town of Los Gatos and Vasona Reservoir, then northeasterly through Campbell and San Jose where it meets the Guadalupe River.
The creek was named after the Alta California land grant Rancho Rinconada de Los Gatos ("Corner of the Cats"), which itself was named for the cougars and/or bobcats that roam in the mountains above the present-day town of Los Gatos. The first settlers, a Spanish family arriving in 1839, were scouting for a homestead in the area when they heard mountain lions roaring and fighting. While frightened, they also recognized it was a good omen, for it meant water couldn't be far away. They discovered the creek and built a home in what is now Vasona Lake County Park. On Hare's 1872 map the creek was called Arroyo de Los Gatos and Zachariah Jones called it Jones Creek at the time he laid out the town he called Jones Mill (which later became the now submerged Lexington, California). Forbes Mill was established by James Forbes along the creek in the 1850s; the town of Los Gatos was subsequently built around the mill.
The construction of State Route 17 in the 1950s forced much of the creek through Los Gatos to be diverted into a concrete gulch. As a Caltrans magazine from the era describes it: "Included in this project is a relocation of Los Gatos Creek for a distance of 6,000 feet, requiring a concrete line channel." The Los Gatos Daily Times on Aug. 31, 1954, reported that "bulldozers have virtually completed clearing and leveling the bed of Los Gatos Creek, and preparations are readied for laying the concrete culvert."
Also in the 1950s, the construction of the James J. Lenihan Dam formed Lexington Reservoir, which flooded much of a small valley above Los Gatos, including the former townsites of Lexington and Alma. The dam and reservoir were completed in 1952, forcing the rerouting of Highway 17. When the reservoir's water level is low, the concrete bed of the old highway through those towns can be seen, along with foundations from some of the buildings. In spite of these events, much of the creek maintains its natural course and beauty.
Below Vasona Park, Los Gatos Creek feeds percolation ponds that are part of the groundwater recharge system built by the Santa Clara Valley Water District. North of Lark Avenue, one can also see a structure resembling a fountain, where imported water from other reservoirs is also added to Los Gatos Creek for recharge. In the 1920s, people discovered that Santa Clara Valley was sinking because of groundwater pumping. San Jose's elevation subsided 13 feet from 1910 to 1970s, correlated with a 250 feet decline in the underground water table. The valley's aquifers were also in danger of being ruined by saltwater infiltration. Local reservoirs were built to provide water for an aggressive groundwater recharge program. While simultaneously dealing with the demands of growing cities, the water district finally managed to stop further sinking by 1980s. Vasona and Lexington reservoirs were part of the effort.
Habitat and wildlife 
Fish were plentiful for the first settlers of Los Gatos Creek. Newspaper stories in the 1880s describe catches of 100 to 200 trout a day. One pioneer wrote that "speckled trout were so plentiful, they could be caught with your hands." Based on the locations of fish collections made in 1895 and historical habitat condition suitable for salmonids, Los Gatos Creek likely supported heavy steelhead (Oncorhynchus mykiss) use throughout. A 1952 California Department of Fish and Game document stated that substantial steelhead runs had not been seen in Los Gatos Creek since 1937, when agricultural pumps lowered the water table throughout the Santa Clara Valley and dewatered the lower reach. However, resident trout populations had remained in the portions of the creek maintaining permanent flow, just below and above of Lexington Reservoir. The Santa Clara Valley Water District reservoir system has now raised water tables sufficiently that lower Los Gatos Creek once again supports steelhead trout and Chinook salmon (Oncorhynchus tshawytscha) that migrate up the Guadalupe River from San Francisco Bay. Both species have been spotted as far up the creek as Hamilton Avenue (see inset photo). Although some have asserted that the Chinook salmon in the Guadalupe River watershed (which includes Los Gatos Creek) are strays from Central Valley hatcheries, a 1992-1994 genetic study of 29 fish showed that some have haplotypes not found in Central Valley wild or hatchery salmon, but found in the Russian River. This is significant because the California Coast Chinook salmon Evolutionarily Significant Unit (ESU) was considered federally threatened September 16, 1999 (64 FR 50394) and reaffirmed June 28, 2005 (70 FR 37160), although the Russian River is normally considered the southernmost limit for this ESU.
Between Lake Elsman and Lexington Reservoir, the creek is pristine and closed to the public. Here, along with rainbow trout (the landlocked form of steelhead trout), beaver, bobcats (Lynx rufus), wild boar (Sus scrofa) and puma (Puma concolor) are extant. The beaver were restocked to the portion of Los Gatos Creek where it enters Lexington Reservoir sometime before Spring 1992, and recently, a beaver reportedly served as "a hearty meal" for a local mountain lion. Historical evidence of beaver in the area includes reference by Captain John Sutter who around 1840 recorded that 1,500 beaver pelts were sold "at a trifling value" by the Indians to Mission San José, the latter only 25 miles from the town of Los Gatos. Physical proof of Golden beaver in south San Francisco Bay tributaries is a Castor canadensis subauratus skull in the Smithsonian Institution National Museum of Natural History collected by zoologist James Graham Cooper in Santa Clara, California on Dec. 31, 1855. Cooper lived in Mountain View, California from October to December, 1855 and collected most of his specimens on Saratoga Creek (then "Quito Creek").
Los Gatos Creek originates at 2350 feet on Loma Prieta Mountain in the Santa Cruz Mountains and flows west to the minor Williams Reservoir above Lake Elsman (also a reservoir formed by Austrian Dam), where it is joined from the north by Austrian Gulch. Its next named tributaries are Hooker Gulch Creek, Moody Gulch and Hendrys Creek, also joining from the north, before Los Gatos Creek enters Lexington Reservoir. In Lexington Reservoir the next tributaries (left) are Aldercroft Creek and Briggs Creek (left), and by the more major Soda Springs Creek (right), then Black Creek (left), Lyndon Creek (left) and Limekiln Creek (right). Below Lexington Dam Los Gatos Creek flow northeast and is joined immediately by Trout Creek (left) then, north of Highway 85, it flows into Vasona Reservoir between Los Gatos and Monte Sereno which is formed by Vasona Dam. In Willow Glen Los Gatos Creek is joined by Dry Creek (left) then, after crossing Interstate 280, El Camino Real and The Alameda, it joins the Guadalupe River in the Guadalupe River Park.
The Los Gatos Creek Trail runs along the river from Lexington Reservoir to the Guadalupe River near downtown San Jose and is popular among local hikers and bicyclists. In Los Gatos, Vasona Reservoir is another reservoir along the creek located in Vasona Park, one of the most popular parks in the Santa Clara County parks system. The Los Gatos Creek Park is located in Campbell, a city that is bisected by Los Gatos Creek.
See also 
- Durham, David L. (1998). Durham's Place Names of California's San Francisco Bay Area: Includes Marin, San Francisco, San Mateo, Contra Costa, Alameda, Solano & Santa Clara counties. Word Dancer Press, Sanger, California. p. 657. ISBN 1-884995-14-4.
- "Moody Gulch". Geographic Names Information System, U.S. Geological Survey.
- U.S. Geological Survey Geographic Names Information System: Los Gatos Creek
- Wiley, Neil. "Lake Elsman". Mountain Network News. Mountain Network News. Retrieved 23 February 2012.
- "Guadalupe Watershed". Santa Clara Valley Urban Runoff Pollution Program. Retrieved 2010-11-14.
- "Measuring Land Subsidence From Space, USGS Fact Sheet-051-00". U. S. Geological Survey. April 2000. Retrieved 11/5/09.
- Doris Sloan (2006). Geology of the San Francisco Bay Region. Berkeley and Los Angeles, California: University of California Press. p. 193. ISBN 0-520-23629-7.
- Suzanne Bohan (4/23/97). "Signs of Life: The creek that welcomed a town finally gets some tender loving care". Los Gatos Weekly Times. Retrieved 11/4/09.
- Leidy, R.A., G.S. Becker, B.N. Harvey (2005). "Historical distribution and current status of steelhead/rainbow trout (Oncorhynchus mykiss) in streams of the San Francisco Estuary, California.". Center for Ecosystem Management and Restoration, Oakland, CA. Retrieved 2009-11-4.
- Nielsen, J. L. (1995). Mitochondrial DNA Frequency Distributions in Chinook Salmon from the Sacramento-San Joaquin Basin and Guadalupe River 1992-1994, California Department of Fish and Game Technical Report FG 2081 IF (Report). Sacramento, California and Monterey, California: California Department of Fish and Game, Anadromous Fisheries Division and Hopkins Marine Station, Stanford University.
- National Marine Fisheries Service, NOAA (1999-9-16). Endangered and Threatened Species; Threatened Status for Two Chinook Salmon Evolutionarily Significant Units (ESUs) in California (Report). 64. Federal Register. p. 50401. http://www.gpo.gov/fdsys/pkg/FR-1999-09-16/pdf/99-24051.pdf. Retrieved 2013-04-21.
- Final 2007 Recovery Outline for the ESU of CC Chinook Salmon (Report). NOAA's National Marine Fisheries Service Southwest Regional Office. 2007-07-16. http://www.swr.noaa.gov/recovery/Chinook_CCCS.htm. Retrieved 2013-04-21.
- Lisa M. Krieger (Oct. 5, 2009). "Tracking the big cats". San Jose Mercury News. Retrieved Nov. 25, 2009.
- Kat Anderson (2006). Tending the wild: Native American knowledge and the management of California. University of California Press. p. 79. ISBN 0-520-24851-1.
- "Castor canadensis subauratus USNM 580354". Smithsonian National Museum of Natural History. Retrieved 2013-04-22.
- Coan, E. (1982). James Graham Cooper, Pioneer Western Naturalist. Moscow, Idaho: Univ. Press Idaho. ISBN 978-0-89301-071-3.
- Los Gatos Creek & Guadalupe River Watershed maps page at Guide to San Francisco Bay Area Creeks
- Video of Chinook Salmon running up Los Gatos Creek in Willow Glen in 1996
- Santa Clara Valley Water District Homepage
- Santa Clara Valley Water District's Guadalupe Watershed
- Worth a Dam organization
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