Glossary of Terms

Created Opening

An opening in the forest cover created by the application of even-aged silvicultural practices.

Criteria air pollutants

A group of common air pollutants (such as carbon monoxide, particulate matter, or ozone) regulated by the Environmental Protection Agency (EPA) on the basis of criteria (information on health and/or environmental effects of pollution). Criteria air pollutants are widely distributed across the country.

Critical Habitat

Areas designated for the survival and recovery of federally listed threatened or endangered species.

Crown fire

A fire burning into and through the crowns of a forest or shrubland.

Crown Height

The distance from the ground to the base of the crown of a tree.


Conservation Strategy

Cultural Resource

The remains of sites, structures, or objects used by people in the past; this can be historical or pre-historic.

Cumulative Effects

Effects on the environment that result from separate, individual actions that, collectively, become significant over time.

CX (or CE)

Categorical Exclusion

DBH (Diameter at Breast Height)

The diameter of a tree 4 and 1/2 feet above the ground on the uphill side of the tree.

Decision criteria

The rules and standards used to evaluate alternatives to a proposed action on National Forest land. Decision criteria are designed to help a decisionmaker identify a preferred choice from the array of alternatives.

Decking area

A site where logs are collected after they are cut and before they are taken to the landing area where they are loaded for transport.


Demolition, dismantling, removal, obliteration, or disposal of a deteriorated or otherwise unneeded asset or component, including necessary cleanup work. This action eliminates the deferred maintenance needs for the fixed asset. Portions of an asset or component may remain if they do not cause problems or require maintenance.

DEIS (Draft Environmental Impact Statement)

The draft version of the Environmental Impact Statement that is released to the public and other agencies for review and comment

Designated Right-of-Way Corridor

A parcel of land, usually linear in shape, that is identified through Secretarial Order in a land use plan or by other management decision as a preferred location for existing and future rights-of-way grants.

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