Driving Surface Aggregate (DSA) is an aggregate mixture of crushed stone designed specifically as a surface-wearing course for unpaved roads.   While larger stones provide the road’s structural support, DSA is a well-balanced mixture, including fines, which holds the road together and produces a dense, tightly paced road surface.  Proper maintenance is required to re-establish the proper mixture.

Natural stone headwalls and endwalls are built to support the roadway at pipes to prevent erosion around pipe installations. The properly constructed headwalls will significantly improve the flow capacity of the pipe.

Underdrains collect subsurface water before it appears on the road surface or in the road ditch.  By intercepting this water underdrains can help dry out road base, ditches, and banks that would otherwise be wet from emerging springs and seeps.  Underdrains also prevent subsurface water from mixing with sediment-laden surface runoff during storm events.

Clarion County’s Dirt and Gravel Road program provides funding to townships to eliminate stream pollution caused by dust and sediment from unpaved roads. 

Funding is distributed to counties by the State Conservation Commission (§ 9106 of the Motor Vehicle Code) and is based on identified pollution sites.  The SCC provides administration and project guidance to Conservation Districts and reports annually to the PA Legislature on program status.   

Technical assistance is provided to districts and townships by Penn State’s Center for Dirt and Gravel Roads.  http://www.dirtandgravel.psu.edu/

 Click here to learn more, including who can apply and
training opportunities.

 Click here to download
the grant application