The Collaborative International Dictionary of English v.0.48:

Wharfage \Wharf"age\, n.
   [1913 Webster]
   1. The fee or duty paid for the privilege of using a wharf
      for loading or unloading goods; pierage, collectively;
      quayage.
      [1913 Webster]

   2. A wharf or wharfs, collectively; wharfing.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wharfage
    n 1: a fee charged for the use of a wharf or quay [syn:
         wharfage, quayage]
    2: a platform built out from the shore into the water and
       supported by piles; provides access to ships and boats [syn:
       pier, wharf, wharfage, dock]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

WHARFAGE. The money paid for landing goods upon, or loading them from a
wharf. Dane's Ab. Index, h.t.