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Create Lake Polygon

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Hello all,

I was wondering the best way to create a lake polygon in ArcMap using a 5m DEM. In my area, they have recently converted 2 small lakes/dams into one large one. The updated data layers are not yet available from the public domain so I was going to generate it myself. I know the current lake's elevation and the dam/damn's location.

I've tried reclassing the raster to the lake's elevation, but that wasn't too successful because the elevation value continued into other drainage basins.

"Ah, to see the world with the eyes of the gods is geography--to know cities and tribes, mountains and rivers, earth and sea, this is our gift."
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Quick and dirty: Use a new feature dataset to create a polygon which bounds the real lake. Then cut the reclassified raster using the polygon (Spatial Analyst (?) => Extract by Mask) and patch it into the original DEM.

There's probably a better solution, but that's what jumps to my mind.

Crischan Wygoda

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