Philodromus - Philodromus alascensis
Hurricane Ridge, Olympic National Park, Clallam County, Washington, USA
July 6, 2013
This female was actively defending the web. When gently disturbed, she rushed forward several inches and waved her forelegs, then retreated to the web.
You can see the collection of environmental items--which I called a cairn in past submissions because the first ones I saw were constructed of tiny bits of rock--under the overlying web, in this case, it's mostly needles. In previous observations, I haven't seen the overlying silk, and don't know what happens to it. (Maybe it just collapses, maybe the spiderlings eat it.)
The location is south-facing, fully exposed rock on the Obstruction Point road, west of the Hurricane Ridge parking area. We saw several females and one male, in every case, we saw nearby either a fresh cairn, as seen here, or one that looked old.
Images of this individual: tag all