Categorical Exclusion

Federal Assistance Activities

Exclusion Text

*N4 Federal Assistance for Actions Involving Stream Work and Modification and Floodways. Federal assistance for repair and restoration actions, hazard mitigation actions other than flood control, or the new construction of facilities that are functionally dependent or facilitate open space use, when the actions are within or affect regulatory floodways, streams, and stream banks and that (a) Involve ground disturbance of less than ½ acre, (b) Involve stream bank work or alteration of less than 300 linear feet, (c) Do not involve hardening or armoring of the stream banks unless the project uses stream or stream bank bioengineering techniques and improve fish passage or habitat, (d) Do not result in adverse flood risk effects to downstream communities, (e) Do not result in any increase of flood levels within the community during the occurrence of the base flood discharge if the action takes place within the regulatory floodway, and (f) Where the effect of the proposed project when combined with other existing or reasonably foreseeable development will not increase water surface elevation of the base flood more than one foot at any point within the community if the action takes place in a floodplain with no regulatory floodway.