The Clean Water Act with amendments by the Oil Pollution Act of 1990 requires response plans for immediate and effective protection of sensitive resources. The ESI data were collected, mapped, and digitized to provide environmental data for oil spill planning and response. See also the NESTS (Nest Points) data layer, part of the larger Bristol Bay Subarea ESI database, for additional bird information. The ESI data include information for three main components: shoreline habitats, sensitive biological resources, and human-use resources. ESI data characterize the marine and coastal environments and wildlife by their sensitivity to spilled oil. Species-specific abundance, seasonality, status, life history, and source information are stored in relational data tables (described below) designed to be used in conjunction with this spatial data layer.This data set comprises a portion of the Environmental Sensitivity Index (ESI) data for the Bristol Bay Subarea. (This area extends from directly south of Goodnews Bay to slightly north of Port Seniavan along the Bristol Bay side of the Alaska Peninsula, as well as the Pacific Ocean side of the Alaska Peninsula from Cape Providence to Kupreanof Peninsula.) Vector polygons in this data set represent locations of bird nesting, migratory staging, and molting, wintering, and feeding concentrations. The Subarea includes marine and coastal areas of Bristol Bay and part of the southern Alaska Peninsula.

This data set contains sensitive biological resource data for shorebirds, waterfowl, raptors, diving birds, and seabirds in the Bristol Bay Subarea. Bristol Bay, Alaska Subarea ESI: BIRDS (Bird Polygons)

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