Generating watershed in 9.3.1

Discussion created by danarob on Sep 20, 2010
Latest reply on Jan 1, 2011 by awhite42
Have generated a Flow direction raster using 10 DEMs, for use in generating a watershed based on a shapefile of pour points which consist of randomly selected stream sample locations.  When generating this watershed raster I get watershed wihich seems to have vertical and horizontal delineations radiating out from the location of the pour point.   This horizontal line appears yo cutoff part of the watershed, and is located over 3 km south of hte edge of the flow direction raster. 
Extent was set to default.  Moving the pour point a few meters "downslope" based on did not change the results.  I feel that it might have to do with flow direction raster, but regeneration of this did not change it either.  I have attached a screen shot.  Does anyone know how to correct this?