The future of a $148 million coastal flood wall in Highlands, N.J., proposed by the U.S. Army Corps of Engineers and primarily funded federally, remains uncertain weeks after it faced strong local opposition . More than three-quarters of the city’s voters, concerned about its effect on property taxes and the potential use of eminent domain for construction, rejected the plan, which was placed on their state ballots on Dec. november But work on a separate, estimated $300 million flood protection program in nearby Port Monmouth is moving forward with the agency’s award late last month of a $62 million final…