By definition, a categorical exclusion refers to a group of actions, typically within a single project, that does not individually or cumulativel have a significant impact on the human or natural environment. These exclusion also, by law have been found to have no effect in the federal guidelines that the National Park Service follows. Because of this, neither an environmental assessment nor an environmental impact statement is required.

Categorical exclusions for 2002, 2003, 2004, 2005 are available electronically (through December 31, 2007). You can find CEs since October 2005 here.