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.

PIPES

Headwalls and Endwalls (188kb): General information on the benefits of headwalls and endwalls at pipes (3/04)
Natural Stone Headwalls (170kb): Details on how to construct headwalls and endwalls out of native stone (2/04)
Pipes: An Overview (71kb): General information on both stream and cross pipes (10/06)
Proper Crosspipe Instalation (216kb): Important considerations and a walkthrough of a typical crosspipe installation. (10/06)
Shallow Crosspipe Instalation (1.5mb): Installing pipes based on outlet elevation, not road elevation, to eliminate outlet trenches. (9/08)

SUB-SURFACE DRAINAGE

French Mattress (297kb): French mattresses allow water to pass under a road through coarse stone. (2/13)
Underdrains (97kb): General information on underdrain and where and why to use it. (4/06)
Constructed Stone Underdrains (146kb): Walkthrough of creating your own underdrain with of perforated pipe, clean stone, and fabric. (4/06)

STREAMS

Corman Clearwater Crossing (208b): Better stream crossings by draining water away from the stream. (3/06)
High-Water Bypass (468kb): Hardened overflow area where water can safely flow over road during extreme events. (3/06)

DRIVING SURFACE AGGEGATE (including Trail Surface Aggregate and general Aggregate Information) - visit the DSA information page

SURFACE DRAINAGE

Crown and Cross-Slope (138kb): Different types of crown and proper cross-slope for unpaved roads. (4/04)
Grade Breaks (210kb): Grade breaks are surface drainage features that stop concentrated flow and road erosion. (3/04)
Broad-Based Dips (1.6mb): Surface dips that transport water across the surface of a low volume road. (9/08)
Conveyor Belt Diversion (260kb): Used conveyor belts embedded in the road to prevent water from flowing down the road. (9/09)
Surface Maintenance (171kb): General information on maintaining unpaved road surfaces. (4/7/04)
The Road Profile (106kb): The importance of the road elevation relative to the surrounding terrain. (7/04)
Raising the Road Profile (121kb): Raising the elevation of the road to achieve better drainage. (7/04)
Tire Bales as Road Fill (152kb): Use of baled waste tires to fill entrenched roads and restore natureal drainage. (4/07)

ROAD SURFACE MAINTENANCE

Carbide-Tipped Blade (142kb): Benefits of a carbide-tipped blade for surface maintenance operations. (2/04)
Grading Sequence with a Carbide-Tipped Blade (118kb): Surface maintenance using carbide-tipped grader blades. (2/04)

ROAD BANKS

Bank Benches (83kb): Steps created in a road bank to slow and control the flow of water over the bank.
"Through-the-bank" Pipes (128kb): A pipe placed through the downhill road bank to get water out of the road profile. (10/06)