Common on our river gravel.
I've seen these a dozen times at this location, but lack the gear to get a nice image.
Skin found under rock
This spider was extremely small, approximately 1/4 cm and had an interesting pattern consisting of dots lighter than its' body. It was found resting in a leaf on the edge of the trail. There was a web approximately 15 cm away and approximately 5 other webs spread throughout the area.