36 CFR 294.45: Environmental documentation.

(a) Environmental documentation will be prepared pursuant to Section 102 of the National Environmental Policy Act, 40 CFR part 1500, and 36 CFR part 220 for any proposed action within a Colorado Roadless Area. Proposed actions that would significantly alter the undeveloped character of a Colorado Roadless Area require an Environmental Impact Statement (EIS).

(b) The Forest Service will offer cooperating agency status to the State of Colorado, for all proposed projects and planning activities subject to this rule that would be implemented on lands within Colorado Roadless Areas. Where the Forest Service does not have the authority to offer formal cooperating agency status, the Forest Service shall offer to coordinate with the State.