Saint Lawrence Seaway
Establishes within the Treasury of the United States the Harbor Maintenance Trust Fund. Provides that amounts from such fund shall be available for: (1) the operation and maintenance of those portions of the Saint Lawrence Seaway operated and maintained by the Saint Lawrence Seaway Development Corporation; (2) the operation and maintenance costs of commercial waterways within the United States; and (3) the payment of certain rebates. Provides for the transfer of certain charges and tolls from the Saint Lawrence Seaway Development Corporation to the Harbor Maintenance Trust Fund.