DESCRIPTION OF THE PROPOSED ACTION: The proposed action consists of modifying Plan 6a as described in the 2012 SHEP FEIS to omit the sediment basin weir and fill flow rerouting measure. USACE is considering the omission of the sediment basin weir and fill from the flow rerouting plan for several reasons, which include: the considerable cost and constructability risks identified with the construction and installation of the weir and fill and the designation of critical habitat for the endangered Atlantic sturgeon. Moreover, additional data and updated models indicate that the flow rerouting measures already constructed from Plan 6a are currently meeting the mitigation requirements outlined in the 2012 SHEP FEIS for the conversion of freshwater wetlands without implementing the sediment basin weir and fill mitigation measure.