Relocation, realignment or modification of portions of a stream channel; reestablishment of the floodplain; installation of instream habitat enhancement features.

If fill material is placed, or would be discharged through grading, excavation, or dredging below the plane of the OHWM of the stream; or if dewatering and construction of a dam is required

Section 404 permit
(USACE)

If the stream is a navigable water of the United States and a structure will be placed in it

Section 10 permit
(USACE) (may be required)

If a Section 404 Permit is required

Section 401 Water Quality Certification *
(RWQCB)

If alteration or modification of the bed, bank, or channel of a stream will occur, including excavation and grading work and removal of existing riparian vegetation

Section 1602 Streambed Alteration Agreement *
(DFG)

If work will be done between levees or within a designated floodway

Reclamation Board Encroachment Permit *

If work will result in discharge of fill or dredged material other waste material into surface waters

National Pollutant Discharge Elimination System (NPDES) permit
(RWQCB)

If work will affect federally-listed terrestrial plant or animal species

Consultation under the Endangered Species Act (ESA) with USFWS; may need a “biological opinion” or “take” permit from USFWS

If work will affect federally-listed fish species

Consultation under the Endangered Species Act (ESA) with USFWS/NMFS; may need a “biological opinion” or “take” permit from USFWS/NMFS

If work will affect state-listed animal species

Consultation under the California Endangered Species Act (CESA) with DFG; may need a state “take” permit from DFG