Informational and Technical Bulletins

Library of Center publications detailing specific "Environmentally Sensitive Road Maintenance" Practices. Each bulletin is grouped by topic area and is specific to one practice.

We are in the process of updating all of the Informational and Technical Bulletins. As a result, all bulletins have been removed from this page. New bulletins will be uploaded in the next few days.


  • Headwalls and Endwalls (423 KB): General information on the benefits of headwalls and endwalls at pipes (6/18)

  • Natural Stone Headwalls (169 KB): Details on how to construct headwalls and endwalls out of native stone (6/04)

  • Pipes: An Overview (70.9 KB): General information on both stream and cross pipes (10/06)

  • Crosspipe Installation (364 KB): Important considerations and a walkthrough of a typical crosspipe installation. (6/18)

  • Shallow Crosspipe Installation (519 KB): Installing pipes based on outlet elevation, not road elevation, to eliminate outlet trenches. (6/18)

Sub-surface Drainage

  • French Mattress (297 KB): French mattresses allow water to pass under a road through coarse stone. (3/13)

  • Underdrains (96 KB): General information on underdrain and where and why to use it. (4/06)

  • Constructed Stone Underdrains (145 KB): Walkthrough of creating your own underdrain with of perforated pipe, clean stone, and fabric. (4/06)


  • Corman Clearwater Crossing (207 KB): Better stream crossings by draining water away from the stream. (3/06)

  • High-Water Bypass (467 KB): Hardened overflow area where water can safely flow over road during extreme events. (3/06)

Driving Surface Aggregate (DSA)

  • DSA (508 KB): A summary of the Center-developed DSA. Includes material specification, sampling and testing, preparation for placement, placement, compaction, maintenance, and other considerations. (7/17)

  • Road Aggregates 101 (401 KB): A summary of size, gradation, and typical use for some of the more common aggregates for road maintenance in Pennsylvania. Includes course aggregates and rip-rap.

  • Trail Surface Aggregate and general Aggregate Information: Visit the DSA information page

Surface Drainage

  • Surface Drainage Practices (338 KB): Road maintenance features designed to shed water from the travelway, including crown and cross-slope, grade breaks, and broad-based dips. (6/18)

  • Crown and Cross-Slope (137 KB): Different types of crown and proper cross-slope for unpaved roads. (1/05)

  • Grade Breaks (209 KB): Grade breaks are surface drainage features that stop concentrated flow and road erosion. (2/04)

  • Broad-Based Dips (1.65 MB): Surface dips that transport water across the surface of a low volume road. (9/08)

  • Conveyor Belt Diversion (255 KB): Used conveyor belts embedded in the road to prevent water from flowing down the road. (9/09)

  • Surface Maintenance (170 KB): General information on maintaining unpaved road surfaces. (1/05)

  • The Road Profile (212 KB): The importance of the road elevation relative to the surrounding terrain. (12/04)

  • Raising the Road Profile (120 KB): Raising the elevation of the road to achieve better drainage. (1/05)

  • Tire Bales as Road Fill (151 KB): Use of baled waste tires to fill entrenched roads and restore natureal drainage. (8/06)

Road Surface Maintenance

Road Banks

  • Bank Benches (224 KB): Steps created in a road bank to slow and control the flow of water over the bank. (6/18)

  • "Through-the-Bank" Pipes (127 KB): A pipe placed through the downhill road bank to get water out of the road profile. (10/06)

Dust Monitoring

  • Real-time Dust Monitoring (615 KB): Informational bulletin about dust monitoring with a vehicle-mounted monitoring system. (2/16)

Photo Tips

  • DGLVR Photo Tips (488 KB): Informational bulletin for taking more effective project photos for use in education and outreach efforts for the Program. (9/17)