CFR > Title 33 - Navigation and Navigable Waters > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER J—BRIDGES (parts 114 to 118) > PART 117—DRAWBRIDGE OPERATION REGULATIONS > SUBPART B—Specific Requirements (§117.51 to §117.1107) > 117.887—Oregon Slough (North Portland Harbor).