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datasets. Therefore, some cleanup is required when merging. <br />StreamLevel (populated) and StreamOrder (not yet populated) are columns in NHDFlowlineVAA <br />(value added attribute). It is unclear if both attributes will be populated in the future. <br />The USGS is not planning to develop an ArcGIS toolkit. <br />Water body extent is determined by the mean pool elevation. This may misrepresent the water <br />body's surface area for some analyses of visualization procedures. <br />Page 13 of 17 ~fifversFde TeChnnlG~yv #nc. <br />4s':rkv Resuurce.s Ergmee: mg ane ~C.u ^sc?lrng <br />