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Let’s look at some examples of less-than-ideal bank protection in Montana

Vertical retaining walls such as these often fail, provide little to no fish habitat, and increase flow velocity.
Grass does not have the root structure to hold banks in place.

This landowner probably removed the native riparian shrubs and trees and replaced them with grass to “improve access”. Unfortunately, this caused erosion that will need to be addressed using rip-rap or (preferably) alternative stabilization methods.

Cars placed in the Missouri River in Great Falls in the 1950s. Using auto bodies for rip rap is now against the law in Montana (Reference: MT Law 75-7-106)
Broken concrete pieces are no longer permitted for bank protection.
Concrete bank armor is ugly, harmful, and subject to failure. It will eventually become undercut and start to break up.
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