I found this picture at http://www.bugguide.net It is a good site for info on miscellaneous bugs. Copyrighted pic, used by permission of Donald Chandler.
Here is a link to the USGS distribution maps to county level and a lot of other information about Stoneflies. A county level checklist is available here, so that you can see which species of stonefly are known to live in your county. With this list in hand you could google images for the species name and may find the stoneflies in your creek.
I found this site through the Plecoptera Society of North America's workshop manual (pdf format)which you can download here.
Stoneflies are amazing, and one of the most sensitive bioindicator macs for pollution and other anthropogenic effects.
A web-based plecoptera key can be found at this University of New Brunswick (CA)website.
The USGS is still an amazing resource, despite having been cut to the bone so many times in recent years. They have similar websites for Mayflies and other taxa which WQ monitors are interested in.
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