Title 16, ConservationRelease 119-110

§6511 Definitions

Title 16 › CHAPTER 84 — HEALTHY FOREST RESTORATION › SUBCHAPTER I — HAZARDOUS FUEL REDUCTION ON FEDERAL LAND › § 6511

Last updated Sep 23, 2026|Official source

Summary

Defines key words used for wildfire planning and fuel-reduction work on federal and nearby lands. It explains what counts as an at-risk community, what fuel-reduction projects are allowed, how community plans should work, how land is rated for fire risk, what official documents and time rules mean, and what the wildland-urban interface is. At-risk community: an area that is either the kind of interface community named in the January 4, 2001 federal notice or a cluster of homes and basic services next to federal land, where conditions could allow a large wildfire and people or property face a serious threat. Authorized hazardous fuel reduction project: the methods named in the Implementation Plan glossary (May 2002) used on the federal lands covered by this law, including fuel breaks and firebreaks. Community wildfire protection plan: a locally agreed plan, made with federal managers, that names and ranks places to treat fuels, says what methods to use on federal and nonfederal land to protect one or more at-risk communities and vital infrastructure, and suggests ways to make buildings less likely to burn. Condition class 2: federal land where fire patterns and vegetation have been moderately changed from historical norms, as described in RMRS–87 (April 2000). Condition class 3: federal land where fire patterns and vegetation have been significantly changed from historical norms, as described in RMRS–87 (April 2000). Day: a calendar day, or if a deadline falls on a nonbusiness day, the end of the next business day. Decision document: a Forest Service decision notice, a BLM decision record, or a record of decision under the Council on Environmental Quality rules. Fire regime I: area with historically low-severity fires every 0–35 years, mainly low-elevation pine, oak, or pinyon-juniper. Fire regime II: area with stand-replacing fires every 0–35 years, mainly low- to mid-elevation rangeland, grassland, or shrubland. Fire regime III: area with mixed-severity fires every 35–100 years, mainly mixed-conifer, dry Douglas fir, or wet Ponderosa pine. Implementation Plan: the May 2002 Implementation Plan for the national collaborative wildfire strategy (and later revisions). Municipal water supply system: reservoirs, canals, pipes, and other surface works used to collect, store, or move drinking water. Resource management plan: a land and resource plan for National Forest units or a land use plan for public lands. Secretary: the Secretary of Agriculture for National Forest lands and the Secretary of the Interior for public lands. Threatened and endangered species habitat: federal land identified in a species listing, a critical habitat designation, or a recovery plan under the Endangered Species Act. Wildland-urban interface: land near or next to an at-risk community as identified in a community plan, or—if there is no plan—land within ½ mile of the community, land within 1½ miles that has steep slopes, helpful geographic firebreaks, or is in condition class 3, or land next to an evacuation route that needs fuel reduction.

Full Legal Text

Title 16, §6511

Conservation, Source: USLM XML via OLRC

In this subchapter:
(1)At-risk community
The term “at-risk community” means an area—
(A)that is comprised of—
(i)an interface community as defined in the notice entitled “Wildland Urban Interface Communities Within the Vicinity of Federal Lands That Are at High Risk From Wildfire” issued by the Secretary of Agriculture and the Secretary of the Interior in accordance with title IV of the Department of the Interior and Related Agencies Appropriations Act, 2001 (114 Stat. 1009) (66 Fed. Reg. 753, January 4, 2001); or
(ii)a group of homes and other structures with basic infrastructure and services (such as utilities and collectively maintained transportation routes) within or adjacent to Federal land;
(B)in which conditions are conducive to a large-scale wildland fire disturbance event; and
(C)for which a significant threat to human life or property exists as a result of a wildland fire disturbance event.
(2)Authorized hazardous fuel reduction project
(A)In general
The term “authorized hazardous fuel reduction project” means the measures and methods described in the definition of “appropriate tools” contained in the glossary of the Implementation Plan, on Federal land described in section 6512(a) of this title and conducted under section 6513 and 6514 of this title.
(B)Inclusion
The term “authorized hazardous fuel reduction project” includes, using the measures and methods described in subparagraph (A), the installation of— (i)
(ii)a natural or constructed barrier used to stop or check a fire or to provide a control line from which to work to stop or check a fire (commonly known as a “firebreak”).
(3)Community wildfire protection plan
The term “community wildfire protection plan” means a plan for an at-risk community that—
(A)is developed within the context of the collaborative agreements and the guidance established by the Wildland Fire Leadership Council and agreed to by the applicable local government, local fire department, and State agency responsible for forest management, in consultation with interested parties and the Federal land management agencies managing land in the vicinity of the at-risk community;
(B)identifies and prioritizes areas for hazardous fuel reduction treatments and recommends the types and methods of treatment on Federal and non-Federal land that will protect 1 or more at-risk communities and essential infrastructure; and
(C)recommends measures to reduce structural ignitability throughout the at-risk community.
(4)Condition class 2
The term “condition class 2”, with respect to an area of Federal land, means the condition class description developed by the Forest Service Rocky Mountain Research Station in the general technical report entitled “Development of Coarse-Scale Spatial Data for Wildland Fire and Fuel Management” (RMRS–87), dated April 2000 (including any subsequent revision to the report), under which—
(A)fire regimes on the land have been moderately altered from historical ranges;
(B)there exists a moderate risk of losing key ecosystem components from fire;
(C)fire frequencies have increased or decreased from historical frequencies by 1 or more return intervals, resulting in moderate changes to—
(i)the size, frequency, intensity, or severity of fires; or
(ii)landscape patterns; and
(D)vegetation attributes have been moderately altered from the historical range of the attributes.
(5)Condition class 3
The term “condition class 3”, with respect to an area of Federal land, means the condition class description developed by the Rocky Mountain Research Station in the general technical report referred to in paragraph (4) (including any subsequent revision to the report), under which—
(A)fire regimes on land have been significantly altered from historical ranges;
(B)there exists a high risk of losing key ecosystem components from fire;
(C)fire frequencies have departed from historical frequencies by multiple return intervals, resulting in dramatic changes to—
(i)the size, frequency, intensity, or severity of fires; or
(ii)landscape patterns; and
(D)vegetation attributes have been significantly altered from the historical range of the attributes.
(6)Day
The term “day” means—
(A)a calendar day; or
(B)if a deadline imposed by this subchapter would expire on a nonbusiness day, the end of the next business day.
(7)Decision document
The term “decision document” means—
(A)a decision notice (as that term is used in the Forest Service Handbook);
(B)a decision record (as that term is used in the Bureau of Land Management Handbook); and
(C)a record of decision (as that term is used in applicable regulations of the Council on Environmental Quality).
(8)Fire regime I
The term “fire regime I” means an area—
(A)in which historically there have been low-severity fires with a frequency of 0 through 35 years; and
(B)that is located primarily in low elevation forests of pine, oak, or pinyon juniper.
(9)Fire regime II
The term “fire regime II” means an area—
(A)in which historically there are stand replacement severity fires with a frequency of 0 through 35 years; and
(B)that is located primarily in low- to mid-elevation rangeland, grassland, or shrubland.
(10)Fire regime III
The term “fire regime III” means an area—
(A)in which historically there are mixed severity fires with a frequency of 35 through 100 years; and
(B)that is located primarily in forests of mixed conifer, dry Douglas fir, or wet Ponderosa pine.
(11)Implementation Plan
The term “Implementation Plan” means the Implementation Plan for the Comprehensive Strategy for a Collaborative Approach for Reducing Wildland Fire Risks to Communities and the Environment, dated May 2002, developed pursuant to the conference report to accompany the Department of the Interior and Related Agencies Appropriations Act, 2001 (House Report No. 106–64) (and subsequent revisions).
(12)Municipal water supply system
The term “municipal water supply system” means the reservoirs, canals, ditches, flumes, laterals, pipes, pipelines, and other surface facilities and systems constructed or installed for the collection, impoundment, storage, transportation, or distribution of drinking water.
(13)Resource management plan
The term “resource management plan” means—
(A)a land and resource management plan prepared for 1 or more units of land of the National Forest System described in section 6502(1)(A) of this title under section 1604 of this title; or
(B)a land use plan prepared for 1 or more units of the public land described in section 6502(1)(B) of this title under section 1712 of title 43.
(14)Secretary
The term “Secretary” means—
(A)the Secretary of Agriculture, with respect to land of the National Forest System described in section 6502(1)(A) of this title; and
(B)the Secretary of the Interior, with respect to public lands described in section 6502(1)(B) of this title.
(15)Threatened and endangered species habitat
The term “threatened and endangered species habitat” means Federal land identified in— (A)
(B)a designation of critical habitat of the species under that Act; or
(C)a recovery plan prepared for the species under that Act.
(16)Wildland-urban interface
The term “wildland-urban interface” means—
(A)an area within or adjacent to an at-risk community that is identified in recommendations to the Secretary in a community wildfire protection plan; or
(B)in the case of any area for which a community wildfire protection plan is not in effect—
(i)an area extending ½-mile from the boundary of an at-risk community;
(ii)an area within 1½ miles of the boundary of an at-risk community, including any land that—
(I)has a sustained steep slope that creates the potential for wildfire behavior endangering the at-risk community;
(II)has a geographic feature that aids in creating an effective fire break, such as a road or ridge top; or
(III)is in condition class 3, as documented by the Secretary in the project-specific environmental analysis; and
(iii)an area that is adjacent to an evacuation route for an at-risk community that the Secretary determines, in cooperation with the at-risk community, requires hazardous fuel reduction to provide safer evacuation from the at-risk community.

Legislative History

Notes & Related Subsidiaries

Editorial Notes

References in Text

The Department of the Interior and Related Agencies Appropriations Act, 2001, referred to in pars. (1)(A)(i) and (11), is Pub. L. 106–291, Oct. 11, 2000, 114 Stat. 922. Title IV of the act is not classified to the Code. For complete classification of this Act to the Code, see Tables.

House Report No. 106–64

, referred to in par. (11), does not exist. However, there was a

House Report No. 106–646

that accompanied H.R. 4578, which became the Department of the Interior and Related Agencies Appropriations Act, 2001. The conference report that accompanied H.R. 4578 was H. Rept. 106–914. The Endangered Species Act of 1973, referred to in par. (15), is Pub. L. 93–205, Dec. 28, 1973, 87 Stat. 884, which is classified principally to chapter 35 (§ 1531 et seq.) of this title. For complete classification of this Act to the Code, see

Short Title

note set out under section 1531 of this title and Tables.

Amendments

2018—Par. (2). Pub. L. 115–141 designated existing provisions as subpar. (A), inserted heading, and added subpar. (B).

Reference

Citations & Metadata

Citation

16 U.S.C. § 6511

Title 16, Conservation

Last Updated

Sep 23, 2026

Release point: 119-110