The Mid State Trail Association seeks out remote, quiet, natural corridors for the Mid State Trail; constructs and maintains footpaths; and acts to protect the resources of the corridor through which the trail passes.

This Sierra Club group exists to explore, enjoy and protect the wild places of the Earth, carrying out its mission in central Pennsylvania.

Shaver’s Creek Environmental Center teaches, models and provides educational experiences that enable individuals and communities to achieve and maintain harmony between human activities and the natural world.

Keystone Trails Association seeks to provide, protect, preserve and promote recreational hiking trails and hiking opportunities in Pennsylvania.

ClearWater Conservancy exists to conserve and restore the natural resources of central Pennsylvania through land conservation, water resources stewardship and environmental outreach in the community.

USYFFT is dedicated to excellence in fly fishing and stream conservation, particularly the enhancement of wild trout stream habitat.