Subject to the following conditions, a non-Federal interest may levy port or harbor dues (in the form of tonnage duties or fees) on a vessel engaged in trade entering or departing from a harbor and on cargo loaded on or unloaded from that vessel under clauses 2 and 3 of section
10, and under clause 3 of section 8, of Article 1 of the Constitution:
(4)
Formulation of port or harbor dues
Port or harbor dues may be levied only on a vessel entering or departing from a harbor and its cargo on a fair and equitable basis. In formulating port and harbor dues, the non-Federal interest shall consider—
(A)
the direct and indirect cost of construction, operations, and maintenance, and providing the facilities and services under paragraph (1) of this subsection;
(B)
the value of those facilities and services to the vessel and cargo;
(C)
the public policy or interest served; and
(D)
any other pertinent factors.