N.J. Stat. Ann. § 40:14-15

Any county or municipality bordering on the Delaware river may, subject to the provisions of section 12:5-3 of the Revised Statutes, erect and construct bulkheads and structures to prevent erosion by said river and fill in behind the same, upon public lands, and upon private lands with the written consent of the owner thereof, at the expense of the county or municipality when authorized so to do by resolution of the board of chosen freeholders of the county or the governing body of the municipality, as the case may be, adopted by a 2/3 vote of the membership of said board or body and declaring that a danger of erosion exists at the time when, and place where, said work is to be performed.