@natureworks
If these were properly constructed stone walls (kiviaed), they would last forever and look better from the beginning. You get what you pay for and take the time to do correctly. When I have time later, I'll look for some photos. Some of our land colleges are offering seminars in building and repairing these.
The short version is that they tend to fall apart in streams relatively rapidly. This results in accelerated erosion and sharp bits that are dangerous for fish and other aquatic species.
I pasted a link to one study below but there are many more.
They are still used as an approach of last resort where nothing else will work. Where they are used, though, they require frequent and often expensive and disruptive maintenance to be successful.
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