Cormorants are not woodpeckers

Cliff (Ledge) Nesting Species

Northern Fulmar, Northern Gannet, Brandt’s Cormorant, Double-crested Cormorant, Great Cormorant, Red-faced Cormorant, Pelagic Cormorant, Herring Gull, Thayer’s Gull, Iceland Gull, Black-legged Kittiwake, Red-legged Kittiwake, Common Murre, Thick-billed Murre, Razorbill, - "Breeding Season Survey Techniques for Seabirds and Colonial Waterbirds throughout North America, Steinkamp, M., B. Peterjohn, V. Byrd, H. Carter, and R. Lowe", p. 18 of 81.

The Nisqually River does have a cliff like area that possibly may house Cormorants. Pelagic Cormorants, according to Petersons' maps are primary residents of the Coastal areas of Washington.

Double Crested Cormorants are noted to be common in the Puget Sound area throughout the year and nest colonially on rocky islands, sea cliffs, or in the trees at lakes.

See also:

http://www.jstor.org/pss/3536609

Changes in....nesting 2002

http://www.birdresearchnw.org/Project-Info/Project-Background/Double-Crested-Cormorants/Columbia-River-Estuary-Corms/default.aspx

Columbia River Estuary 

http://yelmbackyard.blogspot.com/2009/07/woodpeckers.html 

Woodpeckers 

http://yelmbackyard.blogspot.com/2009/11/possibilities-or-not-of-juv-ivory.html 

Fun!