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This API link from EPA shows the Watersheds http://watersgeo.epa.gov/arcgis/rest/services/NHDPlus_NP21/WBD_NP21_Simplified/MapServer?f=jsapi - raw ...


It looks like you found the service to use ... http://watersgeo.epa.gov/arcgis/rest/services/NHDPlus_NP21/WBD_NP21_Simplified/MapServer/ Just plug that in to one of the many samples available and start from there. Go Here and click "Browse Samples" https://developers.arcgis.com/javascript/ Find one that does something similar to what you want to do (or ...

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