to complete the ID? I can't supply the bug, but I can provide a much higher res image. Give me an address if you'd care to see it. (3327 X 2325 px, 660KB jpeg). Also can you determine gender?

Meanwhile I will edit the title to Calineura sp.

Resolution is not really the problem. CA has a limited number of large perlid species (5). Of those, this looks most like Calineuria californica to me. (In particular, the yellowish median stripe on the pronotum and the reddish area over the ocellar triangle are consistent with this species.) C. californica is the only Nearctic representative of the genus, and the species is also recorded for Santa Clara County. However, it should be noted that collection records can help to confirm the presence of a species, but they do not neccessarily indicate the absence of others.

Unless a female is carrying an egg ball or its size can be compared to males of the same species, determining the gender of adult stoneflies from photographs usually requires a clear view of the last few segments of the abdomen. Although most female stoneflies are significantly larger than males, I'm not sure what your size estimate is measuring. A head-to-wingtip measurement is something of an informal convention for adult stoneflies. Measured that way, the C. californica females probably would not be more than about 30-35mm.