Hot answers tagged arcgis-10.0
I'll suggest that you run the WaterShed Tool on the data. It will give a raster which indicates each watershed in that area, and then you can see whether each cell in your study area drains in the same creek or Sink.
I know this has been solved already, but I was having the same issue and it turned out that my feature dataset was located in a personal geodatabase that had reached its size limit and that was causing the problem. ...just in case anyone else stumbles upon this and the above isn't the issue...
Another option would be to use the Minimum Bounding Geometry (Data Management) tool. Creates a feature class containing polygons which represent a specified minimum bounding geometry enclosing each input feature or each group of input features.
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