This is a Sources Sought notice for market research on a seismic retrofit project for the Patillas Dam in Patillas, Puerto Rico. The project scope includes site mobilization, demolition, tunnel liner replacement, embankment work, and installation of monitoring instrumentation. The estimated magnitude of the construction contract is between $250 and $500 million. The notice seeks capability statements from interested contractors, including details on bonding capacity and examples of similar past projects, to help determine the acquisition strategy. This is not a solicitation, and no contract will be awarded from this notice.