These are associated with contracted construction to measure the amount of excavated, deposited, and/or placed material in subsurface areas. These surveys also include investigative studies used for preparing contract bid documents and for directly monitoring and measuring subsequent contract performance, payment, and acceptance.
These determine the present condition of coastal and inland navigation channels, navigation locks, underwater features, river or flood control structures, or beach/bank erosion protection structures. These surveys are used to determine if project conditions have changed enough to warrant future construction or maintenance activities, if additional condition surveys are required at more frequent intervals, or if a greater survey coverage density is necessary.
These assess sedimentation and update area-capacity curves.
These detect the existence and extent of obstructions to the safe use of waterways.
Available Seattle District hydrographic survey data is available on the U.S. Army Corps of Engineers Survey & Mapping website.
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