Approximately 84% of the nation's 600,000 highway bridges in the National Bridge Inventory are built over waterways. Additionally, the most common cause of bridge failures is from floods scouring bed material from around bridge foundations. Therefore, designing bridges to resist scour, evaluating the vulnerability of existing bridges to scour, inspecting bridges for scour, and designing countermeasures for scour has become an important focus area for the Federal Highway Administration (FHWA) and owners of bridges over waterways.

L&G Engineering designs new bridges to resist scour, evaluates the vulnerability of existing bridges to scour, and is capable of designing countermeasures for bridges adversely affected by scour. We are intimately familiar with FHWA guidelines and processes for evaluating and analyzing scour at bridges, including:

• HEC-18 Evaluating Scour at Bridges
• HEC-20 Stream Stability at Highway Structures
• HEC-23 Bridge Scour and Stream Instability Countermeasures