This document presents three classifications for Katmai National Park and Preserve: landcover classes, plant associations, and a revision of Shephard's (2000) ecological subsections. These classifications provide resource managers with essential information to understand the vegetation and ecology of Katmai National Park and Preserve (Katmai). This document also lists vascular plant species identified during the project that were never before identified in the Park, a review of Katmai's ecological literature, climate, vegetation, landscapes, major processes, and the project's methods. The classifications were developed by the National Park Service Landcover Mapping Program, Inventory and Monitoring Program, Alaska Support Office (AKSO) in cooperation with the Alaska Natural Heritage Program (AKNHP) and Geographic Resource Solutions (GRS). GRS and AKSO also developed, in cooperation with AKNHP, the digital landcover map to which the landcover classes and plant associations are linked. Information pertaining to remote sensing analyses, modeling and digital map accuracy assessment are described in Geographic Resource Solutions' Final Report (2003) available from the AKSO.