I bought a construction grade laser level when we built our pond (after an associate ran over a sub-construction grade laser I already had). I flagged it all the way around the pond with plastic flags showing where the water line would be. This gives a good visual indication of what level is.

Since we lacked experience doing this kind of work (we are farmers, not contractors), I was kind of anal checking elevations and making sure we were getting things correct. I even kept checking my flags relative against what was left of the original NRCS flags the agent set to see if what I was doing was in agreement.

Having an unexpected low spot on a dam is not a good thing.

John

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