How is the AHS any more environmentally friendly than a dam? Is it safer than the 6th Street Dam?  By

How is the AHS any more environmentally friendly than a dam? Is it safer than the 6th Street Dam?

The AHS will have an adjustable, not a fixed crest and, thus, will allow for variability in the level of blockage it provides. Because the AHS is purpose-built for sea lamprey control, it will be much smaller than the large dam that exists.