; (L) adding scour protection at bridges; (M) adding spur dikes; (N) the use of natural infrastructure to mitigate the risk of recurring damage or the cost of future repair from extreme weather, flooding, and other natural disasters; and (O) any other features that mitigate the risk of recurring damage or the cost of future repair as a result of extreme weather, flooding, and other natural disasters, as determined by the Secretary. (3) Savings provision Nothing in this subsection limits the ability of a State to carry out a project otherwise eligible under subsection (d) using funds apportioned under section 104(b)(1). . 3. Federal share payable Section 120(c) of title 23, United States Code, is amended by adding at the end the following: (4) Protective features (A) In general Notwithstanding any other provision of law, the Federal share payable for the cost of a protective feature on a Federal-aid highway or bridge project under this title may be up to 100 percent, at the discretion of the State, if the protective feature is an economically justified improvement to mitigate the risk of recurring damage or the cost of future repair from extreme weather, flooding, and other natural disasters. (B) Protective features described A protective feature referred to in subparagraph (A) may include— (i) raising roadway grades; (ii) relocating roadways in a floodplain to higher ground above projected flood elevation levels or away from slide prone areas; (iii) stabilizing slide areas; (iv) stabilizing slopes; (v) installing riprap; (vi) lengthening or raising bridges to increase waterway openings; (vii) deepening channels to prevent flooding; (viii) increasing the size or number of drainage structures; (ix) replacing culverts with bridges or upsizing culverts; (x) repairing or maintaining tide gates; (xi) installing seismic retrofits on bridges; (xii) adding scour protection at bridges; (xiii) adding spur dikes