The fate of the Bloomberg administration’s controversial plan to pave much of Coney Island’s fabled wooden boardwalk with cement could be decided today.

The city’s Design Commission will hold a final hearing on a pilot project the Parks Department has been pushing for more than a year – replacing a five-block stretch of the aging 2.5-mile boardwalk with concrete and plastic.

The plan – if approved – is expected to be a precursor to paving through the entire walkway, except four blocks in the amusement district that would remain wood.

The five-block pilot plan before the Design Commission, which is comprised of members appointed by the mayor, calls for a 12-foot cement pathway for emergency vehicles flanked on each side by 19-foot-wide sections of plastic planks for pedestrians. It would run in the Brighton Beach section of the fabled walkway from Coney Island Avenue to Brighton 15th Street.

While the city says the plan is cost effective, many civic groups and activists say it is all but sacrilegious not to have a wooden boardwalk in Coney Island.

Among the groups expected to speak out against the boardwalk plan at today’s hearing are Coney-Brighton Boardwalk Alliance, Rainforest Relief, NYC Park Advocates and Friends of the Boardwalk.

“If the Parks Department has its way, the Boardwalk will be turned into a concrete roadway! There are in fact many other options available,” the Coney-Brighton Boardwalk Alliance Tweeted yesterday.

However, the city isn’t alone in its support. The park-advocacy group New Yorkers for Parks plans to speak out in favor of the cement plan.

“While far from perfect, the recycled plastic and concrete option would create not only a far more long-lasting and cost-efficient boardwalk, but also one resulting in fewer durability-related closures over time …” the group says in a copy of its prepared testimony to the commission.

“Perhaps in the future, a cost effective, durable local wood will become available. But the locally harvested wood options currently under discussion do not meet the needs of the Boardwalk and are not feasible. The Parks Department’s proposed recycled plastic and concrete solution best ensures the long-term sustainability and durability of the Coney Island Boardwalk.”

The Post first reported the city was looking to replace the boardwalk’s famous – but sometimes rickety – wooden planks in 2008.

Brooklyn Community Board 13 rejected the proposed pilot project on an advisory level in May 2010.

Two small sections total seven blocks in parts of Coney Island near Seagate and Brighton Beach near Ocean Parkway have already been replaced with cement blocks.

The sections are already filled with thousands of cracks, which led to the Design Commission holding off on approving the pilot project in October.

The public hearing is set for 1:25 pm at 253 Broadway, Fifth Floor, in Lower Manhattan across the street from City Hall.