The Sisters Trails Alliance is a non-profit organization, whose mission is to connect people and communities to each other and their natural surroundings. We plan, build and maintain multi-user, non-motorized trails in and around Sisters, Oregon.  

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MYSTERIOUS BLACK PLASTIC BAGS seen along the PRT

Have you recently spotted some large black plastic bags situated along the Peterson Ridge Trails?  Look suspicious?  There’s no need to worry.

So what the heck are they for?

Occasionally STA maintenance crews augment problematic sandy or silty sections of the trails with a Forest Service-authorized natural mineral clay that helps harden the trail tread.  Conditions need to be just right to mix and apply the amended soil and a certain amount of moisture is necessary to bind it effectively.  So crews will occasionally pre-stage 80-lbs bags at trouble spots and wait for just the right time to do the work.  Meanwhile heavy-duty plastic bags keep the material dry.  The bags were tagged and labeled “Do Not Disturb”.

Now you know!

Please help out by not disturbing the caches or opening the plastic bags.



Get Involved!


The Sisters Trail Alliance is always looking for individuals passionate about trails and people who want to see Sisters' Trails developed responsibly. Become a member and support trail projects by helping fund trail work or by volunteering your time to build trails and help form the vision of Sisters area trails.

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REPORT VOLUNTEER HOURS

Please report your volunteer hours here, High Cascades Forest Volunteer Work Report Form.


Sisters Trails Alliance is a non-profit organization, whose mission is to connect people and communities to each other and their natural surroundings. The organization maintains the Peterson Ridge Trail System, hosts an annual speaker series and supports various trail-related activities and events throughout the year.  P.O. Box 1871, Sisters, Oregon 97759, 541-719-8822

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