| Upper Silver Creek | |
| Name Other: | Arroyo de Socayre |
| Pushpin Map: | California |
| Pushpin Map Caption: | Location of mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | California |
| Subdivision Type3: | Region |
| Subdivision Name3: | Santa Cruz Counties |
| Length: | 8.3miles |
| Source1: | Edenvale Hills in southeast San Jose, California |
| Source1 Coordinates: | 37.2458°N -121.7242°W[1] |
| Source1 Elevation: | 1053feet |
| Mouth: | Coyote Creek |
| Mouth Location: | San Jose, California |
| Mouth Coordinates: | 37.2922°N -121.8194°W |
| Mouth Elevation: | 133feet |
Upper Silver Creek is a 8.3adj=midNaNadj=mid[1] northwestward-flowing stream originating in the Edenvale Hills in southeast San Jose, Santa Clara County, California. It was diverted for flood control due west where it is tributary to Coyote Creek, whose waters flow to south San Francisco Bay and the Pacific Ocean.
Historically, Silver Creek was known as Arroyo de Socayre and ran through the Rancho Socayre.[2] [3] Silver Creek was probably named for its silvery appearance, although the word "silver" may have been used to indicate nearby quicksilver (mercury ore) deposits.[4]
The creek currently drains an area of over 6sqmi with its source in the Edenvalle Hills of southeast San Jose, California.[5] Upper Silver Creek and Thompson Creek both begin in the Edenvale Hills, and historically sank into the alluvial basin of Evergreen Valley in southeast San Jose. Then they resurfaced and flowed into a large freshwater marsh known historically as Laguna Socayre, and referred to more recently as Silver Creek Marsh.[6] In 1978, Silver Creek Marsh was excavated into a flood water detention pond or reservoir, now known as Lake Cunningham. Thus, Lower Silver Creek used to begin southwest of where Lake Cunningham is today, but now its source is regarded as just north of this artificial lake by the Santa Clara Valley Water District, now known as Valley Water.[7] In the 1970s, Upper Silver Creek flows were shunted due west into a flood control channel discharging directly to Coyote Creek south of Singleton Road.[8]
In 1962 Upper Silver Creek was reported as an historical migration route and habitat for steelhead trout (Oncorhynchus mykiss).[9] However, in July 1975, California Department of Fish & Game visually surveyed Upper Silver Creek between the U.S. Highway 101 bridge and the headwaters. The survey reportnoted an impassable culvert in the lower reach that was suspected of precluding use by salmonids.[8]