Roadless Area Conservation Act of 2003

Roadless Area Conservation Act of 2003 - Prohibits road construction and road reconstruction in inventoried roadless areas of the National Forest System. Specifies exceptions, including because: (1) there is threat of a catastrophic event; (2) a natural resource restoration action is necessary; or (3) a Federal-aid highway project is in the public interest or is consistent with the purposes for which the land was reserved or acquired.

Forbids timber from being cut, sold, or removed in an inventoried roadless area. Permits various exceptions, including for specified environmental reasons, if the responsible official determines that the cutting, sale, or removal of timber is expected to be infrequent.

Declares that this Act does not: (1) revoke, suspend, or modify legal instruments and decisions concerning the use of NFS land made before January 12, 2001; (2) compel the amendment or revision of any land and resource management plan; or (3) apply to specified activities in the Tongass National Forest.

States that the prohibitions and restrictions of this Act cannot be reconsidered, modified, or terminated under the Forest and Rangeland Renewable Resources Planning Act of 1974.