Sequences of openwork gravel and framework-supported cobble to boulder beds are noted at three locations, over a 20 km stretch of the Tweed Esker, Southern Ontario. Each sequence is characterized by a lower, massive, framework-supported cobble bed, succeeded by a graded bed of openwork cobbles to granules. This sequence is remarkably consistent in internal structure from site to site. There is a similar frequency of these beds and their stratigraphic position is consistently at the top of the esker sequence. A significant, down-esker fining of the coarsest component of the beds is also noted. These beds were probably deposited by flood events occurring after the primary phase of esker deposition. The massive basal unit is identified as a flood deposit. The normally graded openwork cobbles to granules moved as bedload during the late stage of their transport, following transport in suspension. Winnowing occurred at the bedload transport stage. These deposits indicate the presence of an extensive fluvio-glacial drainage focused on the Tweed Esker and provides indirect support for theories of regional ice stagnation, in the Late Wisconsinan, in this area of Ontario.