Use Flow Direction and create d6_flow_direction Use Watershed and select Watershed1, shapefile, and select the streams shapefile. Save as d6_watershed. Select nearby rivers and save as shapefile Start editing and select "Modify Portion of a Line" to extend the streams. Stop and save edits. I then added the river shapefile to a new personal geodatabase which gave me the river lengths. I "start editing" the river layer and manually selected one river with all the new tributaries. I opened the table and used the calculator on the Name Field to manually change all selected cells to that river. Then I created a flow direction and a watershed Convert watershed to vector using Spatial Analyst>Raster to Features Merge watershed with Geoprocessing Wizard Create a layer for each river using Select by Attributes and export data. Created another layer for each layer called Clip_rivername which included only that portion of the river inside the 5 mile buffer. I opened the table, selected the Area_Shape and viewed the statistics sum to get: Upper Talarik Creek: 105,681 meters Kaktuli River: 84,664 meters N.F. Kaktuli River: 106,335 meters I then clipped the watershed for each river to the 5 mile buffer. I opened the table, selected the Area_Shape and viewed the statistics sum to get: Upper Talarik Creek: 84,840,431 sq meters Kaktuli River: 80,720,364 sq meters N.F. Kaktuli River: 95,045,838 sq meters Merged Watershed: 257,182,085 sq meters 5 mile buffer: 271,354,097 sq meters Sanity check comparing 5 mile buffer of deposit to a 5 mile circle: area of a circle = pi * r^2 5 mile radius = 8 046.72 meters area = 3.1415926 * (8 046.72)^2 area = 203,417,187 sq meters Checks out good! Upper Talarik Creek: 84,840,431 m 84,840,431/271,354,097 = 31.3 Kaktuli River: 80,720,364 sq meters 80,720,364/271,354,097 = 29.7 N.F. Kaktuli River: 95,045,838 sq meters 95,045,838/271,354,097 = 35.0 Merged Watershed: 257,182,085 sq meters 257,182,085/271,354,097 = 94.8 5 mile buffer: 271,354,097 sq meters