U.S. Fish & Wildlife ServiceThis layer is a subset of ifsar derived streamlines for Long Island, Alaska. These data have Netmap derived synthetic attributes attributed to 100m reaches, and with symbology showing gradient classified into greater than or less than 12% grade. This grade break is to be a simgle attribute break for possible upper limit of occupancy of anadromous fish. This gradient break serves as rough estimate and is not to be taken as an absolute.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/c903ba54c58249e8a84ee66817da00ba_415engU.S. Fish and Wildlife Service Open DataPublicLong Island Streams IfSAR view [United States]Web servicesUnited StatesLast Modified: 2025-11-20