(b)
Treatment of Certain Federal Employees Employed at Federal Hydroelectric Facilities Located on the Columbia River.—
Pay or compensation paid by the United States for personal services as an employee of the United States at a hydroelectric facility—
(1)
which is owned by the United States;
(2)
which is located on the Columbia River; and
(3)
portions of which are within the States of Oregon and Washington,
shall be subject to taxation by the State or any political subdivision thereof of which such employee is a resident.