Bridge Scour Evaluations in Washington State

by Jeffrey P. Johnson, Northwest Hydraulic Consultants, Kent, United States,
Charles R. Neill, Northwest Hydraulic Consultants, Kent, United States,
Richard P. Hovde, Northwest Hydraulic Consultants, Kent, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


Eighteen existing bridges were investigated for Washington State DOT as part of the FHWA National Scour Evaluation Program. Investigations included review of file information, site inspection, flood hydrology, channel hydraulics, airphoto interpretation, scour depth estimation, and required for mitigation. Observed scour patterns often appeared due to a number of interacting factors, both natural and man-induced. Two case studies of this type are described. Presently recommended procedures for evaluation and design are often difficult to reconcile with recorded scour, particularly when interacting factors are involved. These procedures are, nevertheless, useful for estimating potential maximum scour depths for conservative mitigation designs.

Subject Headings: Scour | Bridge tests | Site investigation | Case studies | Floods | Hydraulic design | Hydraulic structures | Channels (waterway) | Washington | United States

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