There are some road intersections near here. See Google Maps for more information. To get to this on a bicycle from downtown Sisters, come down highway 242 and look for Edgington road on the left. When you get there, there should be a dirt trail that runs parallel to the highway for a short length (but not seeable from it because of trees) like this:
Path --> | |
| |
Edgington | | <-- 242
------------|--|
After you are on the bike path, use your GPS to get there.
There is also a "power line" road that crosses 242 that you can walk or bike from.