Memorandum
U.S. Department of Transportation
Federal Highway Administration

The FHWA Office of Bridge Technology, using the technical expertise of Dr. Scott Douglass (University of South Alabama), has recently completed a joint effort to revise and update FHWA Hydraulic Engineering Circular (HEC) 25, “Highways in the Coastal Environment, 2nd edition”.

The HEC-25 provides the national transportation community guidance for the planning, analysis, design, and operation of highways and bridges in the coastal environment. HEC-25 contents includes information on:

• Tides, Storm Surge, Water Levels, Waves;
• Coastal Sediments and Sediment Transport;
• Revetments and Other Coastal Structures;
• Receding Shorelines and Roadway Overwashing;
• Coastal Bridge Scour, Wave Forces, and Other Issues.

This new 2008 edition of HEC-25 is posted in the Office of Bridge Technology’s Web site and is now available for downloading at www.fhwa.dot.gov/bridge/hydpub.htm. Hard copies of HEC-25 are not available for distribution. The HEC-25 will be the primary reference material for the new NHI course NHI 135082 – “Highway in the Coastal Environment.”

If you have any questions, please contact Mr. Joe Krolak of the FHWA Office of Bridge Technology at (202) 366-4611.