My last work crew, in the Clavey watershed with the Central Sierra Environmental Resource Center, showed me that OHV campers are far worse than backpackers. Forget TP--we had diapers and open latrines. We filled in one, and took out the other. You guess which is which.
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Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963