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Charleston Mayor William Cogswell is requesting $300 million from a proposed $4.25 billion transportation sales tax to extend the Battery along both sides of the peninsula. This joint city-federal project aims to protect Charleston's historic core against rising seas.

The city's contribution is part of a projected $1.3 billion cost, with the Army Corps of Engineers covering 65% pending congressional authorization. The mayor anticipates additional funding from the State Ports Authority and the Union Pier tax increment financing district.

The $300 million request represents 7% of the expected sales tax revenue and aims to improve flood protection and transportation infrastructure. However, a formal legal opinion from the S.C. attorney general is needed to ensure the funding's legality. The project is significant for long-term flood management and community enhancement.