Stevens Creek (California)
|Stevens Creek (Arroyo San José de Cupertino )|
Steelhead trout and spawning redd on Stevens Creek
|Region||Santa Clara County|
|- left||Indian Creek (San Leandro River), Bay Creek, Gold Mine Creek, Swiss Creek, Montebello Creek, Heney Creek|
|City||Mountain View, California|
|Source||Black Mountain in the Santa Cruz Mountains|
|- location||Monte Bello Open Space Preserve|
|- elevation||2,250 ft (686 m)|
|Mouth||Southwest San Francisco Bay|
|- location||Whisman Slough, Mountain View, California|
|- elevation||3 ft (1 m) |
Stevens Creek is a creek in Santa Clara County, California. The creek originates in the Santa Cruz Mountains on the western flank of Black Mountain in the Monte Bello Open Space Preserve near the terminus of Page Mill Road at Skyline Blvd. It flows southeasterly through the Stevens Creek County Park before turning northeast into Stevens Creek Reservoir. It then continues north for 12.5 miles through Cupertino, Los Altos, Sunnyvale and Mountain View before emptying into the San Francisco Bay at the Whisman Slough, near Google's main campus.
The creek was originally named Arroyo San José de Cupertino (Spanish for Saint Joseph of Cupertino Creek) by Spanish explorer Juan Bautista de Anza, who camped along the creek on his expedition from Monterey to San Francisco. De Anza completed the first overland route to San Francisco Bay when he and Father Pedro Font sighted the bay from a prominent knoll near the entry of Rancho San Antonio County Park. In de Anza's diary on March 25, 1776, he states that he "arrived at the "Arroyo San José de Cupertino", which is useful only for travelers. Here we halted for the night, having come eight leagues in seven and a half hours. From this place we have seen at our right the estuary which runs from the port of San Francisco." The Diocese of San Jose recently dedicated de Anza's Knoll as permanent public open space.
The Saint Joseph of Cupertino place name is preserved today in the city of Cupertino to the east and in the Saint Joseph of Cupertino Parish Catholic church in the city. The Arroyo San José de Cupertino became Cupertino Creek sometime before 1866, but was later re-named for Elijah Stephens (how his name was misspelled is unknown), a South Carolina-born blacksmith and trapper who settled on Cupertino Creek in 1848. Stephens renamed his 160-acre (0.65 km2) property at the base of Black Mountain "Blackberry Farm". Stephens is notable for being the captain of the Stephens-Townsend-Murphy Party, the first wagon train to cross the Sierra Nevada (two years before the ill-fated Donner Party). 
Stevens Creek consists of approximately 20 miles (32 km) of channel, and enters the San Francisco Estuary near Long Point, north of Moffett Field Naval Air Station, at Whisman Slough between Mountain View's Shoreline Park and Stevens Creek Shoreline Nature Study Area. It drains a watershed of about 29 square miles.
There is one major impoundment (dam), Stevens Creek Reservoir at 531 feet (162 m) of elevation. The reservoir was constructed in 1935 to provide storage capacity of winter runoff that could be used to recharge the Santa Clara valley aquifer. The reservoir is managed by the Santa Clara Valley Water District (SCVWD) and has a current capacity of 3,465 acre feet (4,274,000 m3) of water. As currently managed by the SCVWD, flows are released during summer months which result in maintaining a wet channel for approximately 5.7 miles (9.2 km) downstream of the Reservoir (to Fremont Avenue) in order to preserve steelhead.
Tributaries above the Stevens Creek Reservoir include Indian Creek, Bay Creek, Gold Mine Creek, Swiss Creek and Montebello Creek. One tributary, Heney Creek, joins the mainstem 3.7 miles (6.0 km) below the Reservoir. Additionally, a diversion channel from Permanente Creek (constructed in 1959) sends winter storm flows into Stevens Creek approximately 6.3 miles (10.1 km) below the reservoir.
Stevens Creek Trail
The Stevens Creek Trail is a 5-mile (8 km) long bicycle and pedestrian path that runs south continuously from Shoreline Park to Heatherstone Way in Mountain View. Cupertino has now added a 0.7-mile (1.1 km) section of trail that runs north along the creek from McClellan Road, then past the 4-H farm and community gardens in McClellan Ranch Park nature preserve and ending (for now) at Blackberry Farm Park. The trail is entirely separated from vehicular traffic, using numerous overcrossings and underpasses. The four cities of Sunnyvale, Cupertino, Los Altos, and Mountain View are cooperating on potential trail alignments with the goal of a completed trail from the Bay to the Santa Cruz Mountains.
Habitat and conservation
Stevens Creek is one of the prime steelhead (Oncorhynchus mykiss) habitats within the county. However, there are significant barriers for this anadromous fish. In a 1994 study, the Santa Clara Valley Water District (SCVWD) found fish ladders at the Central Expressway and Highway 101 often had insufficient flow and/or were clogged with debris and sediment. In addition, the drop structure at L’Avenida Avenue was impassable in all five years of the study. In August, 2003 the Stevens & Permanente Creeks Watershed Council was officially formed to support stewardship of the watersheds. The SCVWD’s Fish and Aquatic Habitat Collaborative Effort (FAHCE), has recommended removal of the Denil-type fish ladders at Fremont Avenue, Evelyn Avenue, and Moffett Boulevard which tend to clog with debris and are now classified as partial barriers by the California Department of Fish and Game (CDFG). Adjacent to the fish ladder at Moffett Boulevard is a concrete drop structure built in the 1980s which is another obstacle to salmonid passage. The existing concrete-lined channel extending further downstream to Highway 101 (a distance of 450 feet) is flat and low flows cross it as a thin sheet of water over the concrete bottom. At least 6-inch depth of flow is required for adequate fish passage. Although steehead continue to spawn in lower Stevens Creek, it is doubtful whether young trout can oversummer for one to two years in its drier, hotter lower reaches. In a 2004 report of factors limiting steelhead trout survival, the key recommendation was to improve access for spawning steelhead in the lower reaches of the creek (which gets very warm or even dry in summer) to the upper reaches of Stevens Creek which have perennial flows of colder water. In addition, if the Permanente Creek Diversion Channel could be modified to accommodate steelhead trout in-migration, then several miles of upper Permanente Creek (which currently has a resident rainbow (the landlocked form of steelhead) trout population would be available for spawning. A NOAA/National Marine Fisheries Service report on the Stevens Creek steelhead trout population in April 2013 found a high density of spawning Redd (biology)#Egg below the Evelyn Avenue fish ladder and grade control structure, but that this barrier was forcing most of the steelhead to spawn in the undesirable lower reaches of the stream, and that it has been a significant barrier to upstream spawning runs for at least the past four years.
The Western Burrowing Owl (Athene cunicularia) nests at Shoreline Park near the mouth of Stevens Creek. In 2008, Mountain View evicted a pair of burrowing owls so that it could sell a parcel of land to Google to build a hotel at Shoreline Boulevard and Charleston Road. Eviction of the owls is controversial because the birds regularly reuse burrows for years, and there is no requirement that suitable new habitat be found for the owls. Despite being listed in 1979 as a Species of Special Concern (a pre-listing category under the Endangered Species Act) by the California Department of Fish and Game, California's population declined 60% from the 1980s to the early 90's, and continues to decline at roughly 8% per year. In 1994, the U.S. Fish and Wildlife Service nominated the Western Burrowing Owl as a Federal Category 2 candidate for listing as endangered or threatened, but loss of habitat continues due to development of the flat, grassy lands used by the owl. According to The Institute for Bird Populations at Point Reyes, there has been a 50 percent decline in burrowing owl populations in the Bay Area in the last 10 to 15 years. Their status protects them from disturbance during nesting season or killing at any time, but does not guarantee them a permanent home, as outside of breeding season, owls can be evicted from their homes. A 1992-93 survey reported no breeding burrowing owls in Napa, Marin, and San Francisco counties, and only a few in San Mateo and Sonoma. The Santa Clara County population is declining and restricted to a few breeding locations, leaving only Alameda, Contra Costa, and Solano counties as the remnant breeding range.
- 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. 707. ISBN 1-884995-14-4. Retrieved Jan 1, 2010.
- U.S. Geological Survey Geographic Names Information System: Stevens Creek
- de Anza, Juan Bautista (1776). Diary of Juan Bautista de Anza October 23, 1775 - June 1, 1776. University of Oregon Web de Anza pages. Retrieved 2009-09-08.
- "Stevens Creek: Historic, Navigable, Misspelled". Retrieved 2009-09-21.
- History of the Rengstorff House from http://www.r-house.org/stevens-creek.html
- "Stevens Watershed, Santa Clara Valley Urban Runoff Pollution Prevention Program". Santa Clara Valley Urban Runoff Pollution Prevention Program. Retrieved Dec 1, 2010.
- Teater & etc. (2004). "Map of Shoreline Park and Stevens Creek, Hetch-Hetchy Trails". City of Mountain View.
- "Stevens Creek Trail Status". Cupertino, CA: Friends of the Stevens Creek Trail. 2009-07-02. Retrieved 2009-07-19.
- 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 2009-10-18.
- "Stevens Creek and Permanente Creeks Watershed Council: About US". Retrieved 2009-11-09.
- Saeid Hosseini, Ted Ibarra, Jae Abel, Bobby Tan (June 2009). FAHCE Stevens Creek Fish Passage Enhancement Project No. 00294001 Problem Definition/Refined Objectives Report (Report). Retrieved Jan 14, 2010.
- Stillwater Sciences (2004-09-10). Stevens Creek Limiting Factors Analysis (Report). SCVURPPP. p. 33. Retrieved 2013-09-20.
- Darren Howe, Gary Stern (2013-04-19). Stevens Creek Survey and Observations (Report). NOAA/NMFS.
- DeBolt, Daniel (January 10, 2008). "Burrowing Owls vs. Google:Pair of birds found on Google's hotel site will cost city $150,000". Mountain View Voice.
- Rendon, JIm (Nov–Dec 1999). "Owl Be Damned:Developers plow into the homes of the burrowing owl". Metro, Silicon Valley's Weekly Newspaper.
- Donna Whitmarsh. "Antioch Developer Evicts Burrowing Owls". Bay Nature. Retrieved Jan 1, 2010.
- Joe Eaton (Jan 14, 2010). "Wild Neighbors: Antioch Owls Face Evicition". Berkeley Daily Planet. Retrieved Jan 14, 2010.
- Stevens Creek and Permanente Creek Watershed Council
- Friends of Stevens Creek Trail
- Nearby Hiking Trails in Santa Clara County - San Jose Wiki
- Santa Clara County Creeks Coalition
- Stevens Creek Historic and Watershed maps page at Guide to San Francisco Bay Area Creeks
- U.S. Geological Survey Geographic Names Information System: Stevens Creek
- Species of the Month - Santa Clara Valley Habitat Conservation Plan
- Protecting the Western Burrowing Owl, City of Mountain View, CA