Here is what their website states: I see nothing about the Columbia River except if you are launching from the Ports in Oregon.....

When will I be required to have a TWIC?
Workers will be required to possess a TWIC by the compliance date set for their specific Captain of the Port (COTP) zone.
Below is the latest schedule for COTP zone compliance. All compliance announcements will be made in the Federal Register at least 90 days in advance.
Date COTP Zone(s)
October 15, 2008
Northern New England
Boston
Southeastern New England

November 28, 2008
Corpus Christi
North Carolina
Cape Fear River

December 01, 2008
Long Island Sound
Charleston
Savannah
Jacksonville

Change as of 10/27:
Buffalo
Duluth
Detroit
Lake Michigan
Sault Ste. Marie
December 30, 2008
Baltimore
Delaware Bay
Mobile
Pittsburgh
Ohio Valley
Lower Mississippi River
San Diego

January 13, 2009
Hampton Roads
Morgan City
New Orleans
Upper Mississippi River
Miami
Key West
St. Petersburg

February 12, 2009
Honolulu
South East Alaska
Prince William Sound
Western Alaska

February 28, 2009
Puget Sound
Portland(OR)
San Francisco Bay
March 23, 2009
New York

April 14, 2009
Guam
Houston/Galveston
Los Angeles/Long Beach
San Juan
Port Arthur

Coast Guard announces Transportation Worker Identification Credential compliance dates for Oregon, California, Washington, New York
WASHINGTON — The U.S. Coast Guard and the Transportation Security Administration announced Thursday that Feb. 28, 2009, is the Transportation Worker Identification Credential compliance date for owners and operators of facilities located within the U.S. Coast Guard Captain of the Port Zones of Portland, Ore., Puget Sound, Wash., and San Francisco Bay, Calif., while the compliance date for Captain of the Port Zone of New York is March 23, 2009.

Ports affected by the Feb. 28, 2009, compliance date include, among others, Astoria, Portland, Pacific City, Coos Bay and Port Orford, Ore., Longview, Blaine, Neah Bay, Anacortes, Everett, Seattle, Tacoma and Olympia, Wash., and Crescent City, Humboldt, Bodega Bay, Stockton, San Francisco, Santa Cruz and Monterey Harbor, Calif.