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Creek in Santa Clara County, California

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,

Stevens Creek 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 (75 km2). 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 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 mile (9 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 mile (6 km) below the Reservoir. Additionally, a diversion channel from Permanente Creek (constructed in 1959) sends winter storm flows into Stevens Creek approximately 6.3 mile (10 km) below the reservoir. Cupertino has completed an approximately 1 mile (2 km) section of trail that runs north along the creek from McClellan Road to Stevens Creek Blvd., passing the 4 H farm and community gardens in McClellan Ranch Park nature preserve, and the 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 cooperated on potential trail alignments with the goal of a completed trail from the Bay to the Santa Cruz Mountains; they produced a recommendation, which was approved by all four cities, and then disbanded their joint city working team.

Stevens Creek was one of the prime steelhead (coastal rainbow trout) (Oncorhynchus mykiss irideus) habitats within the county. The Sportsman Gazetteer in 1877 touted Stevens Creek as a trout fishing destination. Six physical specimens were collected in 1893 by Stanford Biology Professor W. W. Thoburn and are in the California Academy of Sciences collection. In 1898 John Otterbein Snyder collected steelhead trout specimens in Stevens Creek. Leidy reviewed numerous historical observer and sampling records of steelhead trout in Stevens Creek throughout the twentieth century and noted that hatchery stock planted in the creek did not seem to survive like the native, wild trout did. In a genetic study of fish from Santa Clara Valley streams, Stevens Creek and other trout had coastal steelhead ancestry and no substantial introgression of hatchery trout. The Stevens Creek fish were closely related to the steelhead trout in nearby basins. However, there are significant barriers for anadromous steelhead to run up Stevens Creek to spawn. In a 1994 study, the Santa Clara Valley Water District (SCVWD) found fish ladders at the Central Expressway and U. S. Route 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 (137 m)) is flat and low flows cross it as a thin sheet of water over the concrete bottom. At least depth of flow is required for adequate fish passage. Although steelhead 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 addition, if the Permanente Creek Diversion Channel could be modified to accommodate steelhead trout in migration, then potentially 9 mile (14 km) of upper Permanente Creek, which currently holds a population of resident coastal rainbow trout, would be available for spawning. Under the water district's Fish and Aquatic Habitat Collaborative Effort (FAHCE), Stevens Creek has been identified as one of the prime steelhead habitats within Santa Clara County and plans are underway to remove three barriers to fish passage in the lower creek: at Moffett Boulevard, Evelyn Avenue and Fremont Avenue. Stevens Creek Dam blocks 8.6 mile (14 km) of potential anadromous steelhead trout spawning habitat further upstream.

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 1990s, 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.

On December 23, 1964, the Office of Historic Preservation designated Arroyo de San José Cupertino as a California historical landmark #800. A description on the commemorative plaque reads: "This arroyo honoring San Joseph, patron saint of flight and students, was first discovered and traversed by Spanish explorers in 1769. On March 25 26, 1776, Colonel Juan Bautista de Anza made it his encampment No. 93, as mapped by his cartographer, Padre Pedro Font, on his journey to the San Francisco Bay area where he initiated a colony, a mission, and a presidio."