Point Francis or Portage Island, on the southwest side of the bay, was studied by Vonheeder (1972). He found the south facing shoreline of the island to be eroding from southerly wave attack.
Then you will know the truth, and the truth will set you free.John 8:32 NIV
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Coastal Processes of the Whatcom County Mainland (dnr.wa.gov)Numerous natural erosional and depositional processes operate upon shorelines to create a diversity of coastal landforms. Waves are among the most important causes of this diversity as they remove, build, and shape beaches and sea cliffs.
Bellingham Bay (figure 14)