Presidio Coastal Trail (Completed Spring 2012)

Park Tread® Surfacing


Park Tread® surfacing blends into the environment visually, aesthetically, and structurally allowing users to experience sensitive ecosystems and watersheds with minimal impact.

Throughout Barth Campbell’s career in trail design, construction, and restoration he has come across many trail tread products, all of which he was unsatisfied with their durability, restrictions, and environmental sensitivity. Granular quarry fines, tree sap infused fine granular material, and decomposed granite mixed with cement are among the many products that Barth has come across. Often the installations of these materials are tricky, some need to be installed within 24 hours or less of mixing and are very unstable when installed at temperatures below 68 degrees or above 90 degrees. Once installed and exposed to the elements the binding capabilities of the materials often then deteriorate with moisture creating high maintenance costs, a safety hazard, erosion, and ongoing repairs. Barth’s inability to find a natural sustainable surfacing material for parks, trails, roads, and parking lots lead him to create Park Tread®.

Durable and Stable
Park Tread® material has long term structural integrity and stability make it superior to other trail tread products on the market. Park Tread is made from quarried shale/chert processed specifically to meet durability standards required for trails, roads, and parking lots. Park Tread has been tested by laboratories and has been used on projects for the National Park Service, California State Parks, and County/Regional Parks. Park Tread’s ability to exceed the requirements for firmness, stability, and texture make it an accessible surfacing material, used to meet trail guidelines on AGODA (Accessibility Guidelines for Outdoor Developed Areas) and ABAAS (Architectural Barriers Act Accessibility Standard). Park Tread maintains its structural reliability and visual appearance in high traffic areas including parking lots, multi-use trails, staging areas, picnic grounds, and equestrian environments. Park tread has a high tolerance for harsh weather conditions ranging from freezing temperatures to extreme heat.

Resistance to Pot Holing
Park Tread® material's natural binding agents make it a superior surfacing product for resisting pot holing in areas with vehicular traffic. This leads to decreased annual/long term maintenance and sediment delivery in storm water runoff.

Low Surface Temperatures
A trail surfaced with Park Tread® has a high albedo, which means it has a high solar reflectance and will keep the near surface air cool. When a trail is cool so are the trails users, including pets and wildlife. Surface water on or near the trail will not increase in temperature and will not have a negative impact on the temperatures of the nearby waterways

Low Maintenance
The ability of Park Tread® surfacing a great choice for trails and roads that travel through sensitive areas and waterways.

Pollutant Free
Park Tread® materials is free of heavy metals, toxins, pesticides, and other pollutants, which eliminates the chance of leaching or contaminating run-off.

Sourced and Processed in Northern California
Park Tread® materials has a relatively low total carbon footprint due to the regionally-located quarry and the product’s on-site processing.

User Experience
Park Tread® surfacing blends into the environment visually, aesthetically, and structurally allowing users to experience sensitive ecosystems and watersheds with minimal impact. Park Tread allows trails to exist for generations in areas that site conditions might not have otherwise allowed.

Trademark of Barth Campbell, Patent Pending

Contact: Barth Campbell


barth [at] campbellgradinginc [dot] com