Monitoring Scour at Bridge Piers in Snohomish Co., WA

by Anthony P. Nahajski,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


Washington State, Snohomish County Public Works Department is using a new Fixed Mechanical monitoring device, to augment its current program of monitoring scour at bridge piers. The Public Works Department maintains 174 bridges over rivers and waterways. About 10% of the structures are known to be susceptible to general and local scour. Two years ago, the Surface Water Management Division began monitoring the pier scour at selected bridges with the new device. The following describes the development of the program, installation of the device and fixing method, determining device location at bridge piers, and protecting the instrument from damage by flood borne debris. Application of structural measures to minimize erosion and scour, and approaches to automation of monitoring, are suggested.

Subject Headings: Scour | Piers | Bridges | Maintenance and operation | Erosion | Bridge management | Waterways | Washington | United States

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