Areas of Conservation Emphasis II (ACE II) is a compilation of statewide, spatial data addressing specific biological and recreational values, threats, and landscape considerations that can be used to identify areas of biological or conservation interest in the landscape. The documents here describe the data and modeling process used for this project.CDFW Data Portal RSS Feed GeneratorThu, 16 Apr 2026 10:54:36 -0700https://nrm.dfg.ca.gov/documents/ContextDocs.aspx?cat=ACECalifornia Department of Fish and Wildlife Data Portal120https://nrm.dfg.ca.govhttps://nrm.dfg.ca.gov/images/ca_dfg/CDFW-Insignia-146x193.png85en-usSearch Documentshttps://nrm.dfg.ca.gov/documents/ContextDocs.aspx?cat=ACEsearchACEAreas of Conservation Emphasis - This document provides user instructions for the ACE BIOS viewer.26186:6https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=26186Thu, 16 Apr 2026 10:54:36 -07002026-01-01T00:00:00Areas of Conservation Emphasis - 150835:18https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150835Fri, 19 Dec 2025 11:00:04 -08002025-12-01T00:00:00CHAT and ACE-II - This document is a brief comparison of the Western Governors' Crucial Habitat Assessment Tool(CHAT) and the Areas of Conservation Emphasis ACE-II).76375:4https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=76375Sun, 16 Apr 2023 14:39:19 -07002014-01-23T00:00:00ACE - 195655:2https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=195655Mon, 13 Dec 2021 19:34:56 -08002021-01-01T00:00:00ACE User Guidance - Document with instructions for users describing how to download a species list by ACE hexagon. 190611:3https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=190611Fri, 12 Mar 2021 18:20:21 -08002021-03-01T00:00:00Areas of Conservation Emphasis - 150834:7https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150834Thu, 05 Mar 2020 12:39:03 -08002017-10-01T00:00:00Areas of Conservation Emphasis - 160957:3https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=160957Mon, 07 Oct 2019 11:16:05 -07002018-01-01T00:00:00Areas of Conservation Emphasis - 170744:5https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=170744Wed, 21 Aug 2019 19:28:53 -07002019-07-01T00:00:00ACEACE - 24397:10https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=24397Thu, 28 Jun 2018 12:18:36 -07002010-01-01T00:00:00Areas of Conservation Emphasis - 152834:4https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=152834Tue, 22 May 2018 12:25:30 -07002017-12-01T00:00:00Areas of Conservation Emphasis - 150814:7https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150814Tue, 22 May 2018 12:21:48 -07002017-10-01T00:00:00Areas of Conservation Emphasis - 150831:6https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150831Tue, 22 May 2018 12:20:03 -07002017-10-01T00:00:00Areas of Conservation Emphasis - 150816:7https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150816Tue, 22 May 2018 12:17:05 -07002017-10-01T00:00:00Areas of Conservation Emphasis - 150855:5https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150855Tue, 22 May 2018 12:14:24 -07002017-10-01T00:00:00Areas of Conservation Emphasis - 150853:5https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150853Tue, 22 May 2018 12:09:48 -07002017-10-01T00:00:00Areas of Conservation Emphasis - 150856:5https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150856Tue, 22 May 2018 12:04:51 -07002017-10-01T00:00:00Areas of Conservation Emphasis - 150854:6https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150854Tue, 22 May 2018 12:02:10 -07002017-10-01T00:00:00Areas of Conservation Emphasis - 150836:6https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150836Thu, 22 Feb 2018 14:36:10 -08002017-10-01T00:00:00ACE-IIACE-II - The mission of the Department of Fish and Game (Department) is unique in its broad responsibility to conserve California’s natural resources for both ecological and recreational values. To meet its responsibilities and comply with specific laws and mandates, the Department must establish programs and processes that will guide and inform its priorities for species and habitat conservation. The goal of the Areas of Conservation Emphasis project (ACE-II) was to build a spatial model that would incorporate Department priorities and mandates, be transparent and repeatable, use the best available science, and be flexible and responsive to specific management questions or funding opportunities. ACE-II is a compilation of statewide, spatial data addressing specific biological and recreational values, stressors, and landscape considerations analyzed at a consistent scale of 2.5 square mile hexagons that can be used in a flexible manner to identify areas of biological or conservation interest. 24326:11https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=24326Thu, 22 Feb 2018 09:46:53 -08002010-01-01T00:00:00154554:1https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=154554Wed, 14 Feb 2018 22:31:04 -08002018-02-01T00:00:00Areas of Conservation Emphasis - 150852:4https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150852Wed, 14 Feb 2018 19:22:14 -08002017-10-01T00:00:00Areas of Conservation Emphasis - 150681:8https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150681Wed, 14 Feb 2018 19:18:07 -08002017-10-01T00:00:00ACE-IIACE-II - This flow chart shows the process used to develop the ACE-II weighted-additive biological index model.24369:5https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=24369Wed, 07 Sep 2011 16:01:59 -07002010-01-01T00:00:00ACE-IIACE-II - This document is Appendix C of the Areas of Conservation Emphasis (ACE-II) Project Report, available as a separate file. Appendix C includes lists of native and harvest species used in the ACE-II species richness calculations for birds, mammals, plants, amphibians, reptiles, and fish. Also included are lists of species found in California but not included in the analysis.24327:6https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=24327Wed, 11 May 2011 16:07:19 -07002010-01-01T00:00:00ACE-IIACE-II - This document is Appendix D of the Areas of conservation emphasis (ACE-II) project report, as a separate document. Appendix D includes a list of the rare species used for ACE-II rare species richness and rarity-weighted richness calculations. The list includes the status of each species, as well as the number of hexagons occupied by each species based on the occurrence data used in the analysis.24328:5https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=24328Wed, 11 May 2011 16:07:11 -07002010-01-01T00:00:00ACE-II - Reference table of counties by USDA Ecoregion Section in California.25068:3https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=25068Wed, 11 May 2011 16:07:01 -07002010-01-01T00:00:00ACE-IIACE-II - 26187:2https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=26187Wed, 11 May 2011 16:06:56 -07002010-08-01T00:00:00ACE-IIACE-II - This document summarizes the uses and limitations of ACE-II, and includes the ACE-II data disclaimer.24370:4https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=24370Wed, 11 May 2011 16:06:40 -07002010-01-01T00:00:00