Up behind Dunsmuir House, near Oakland’s eastern end past the zoo and just before Sheffield Village, is a little wooded valley with this stream in it. It’s surely the reason that Dunsmuir House was built where it was, since the old places had to rely on surface water or their own wells. The Hayward fault runs very near this spot, through the swale that Dunsmuir House sits in. I don’t know where it leads. It may be an independent stream, between Arroyo Viejo and San Leandro Creek. It may connect with Elmhurst Creek, the ditch running past the south side of the Coliseumthat’s the way the contours seem to lead. Oakland has about twenty named streams, nearly all of them culverted today.
The bedrock is supposed to be either gabbro of the Coast Range Ophiolite or quartz keratophyre at the base of the Great Valley Sequence, but I wasn’t paying close attention to it. I remember it as nondescript, like a lot of Oakland bedrock.
I took this picture in March 2005.