One of four Central Valley Project Improvement Act tools that can be used to promote increases in the natural production of anadromous fish.
Structural modifications result in changes to facilities that impair fish movement patterns, and result in increased opportunities for successful fish passage.
For example, a structural modification may include the installation of a fish ladder that allows adult salmon to move upstream above a dam. Alternatively, a structural modification could also result in the removal of a barrier that prevents small salmon from moving downstream to the Pacific Ocean.
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