I don't have a working camera atm so no pictures, but I

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I don't have a working camera atm so no pictures, but I have a creek which stretches for several miles off my property. It flows into a pond, and then through a drain onto the rest of our valley. I've been cobbling together a tiny dam setup using large creek rocks and grass turf. I also use moss and the river plants to build a little land bridge with an outlet for the water in the middle. I've been concreting flat stones into the bridge with mud. The hope is that the grass roots grow and connect, creating a rope like barrier holding the rocks and dirt in place. Plus the river plants and moss would possibly block any water that might threaten the integrity of the bridge. The bridge has been in place for several days now and I'm just curious if it will last and if my theory is correct.