OAR 250-011-0160: Anchored Vessels and Vessels Aground

(1) A vessel at anchor shall exhibit where it can best be seen: (a) In the fore part, an all-round white light or one ball; and (b) At or near the stern and at a lower level than the light prescribed in section (1)(a) of this rule, an all-round white light. (2) A vessel of less than 50 meters in length may exhibit an all-round white light where it can best be seen instead of the lights prescribed in section (1) of this rule. (3) A vessel at anchor may, and a vessel of 100 meters or more in length shall, also use the available working or equivalent lights to illuminate its [decks. (4) A vessel aground shall exhibit the lights prescribed in section (1) or (2) of this rule and in addition, if practicable, where they can best be seen: (a) Two all-round red lights in a vertical line; and (b) Three balls in a vertical line. (5) A vessel of less than seven meters in length, when at anchor, not in or near a narrow channel, fairway, anchorage, or where other vessels normally navigate, shall not be required to exhibit the lights or shape prescribed in sections (1) and (2) of this rule. (6) A vessel of less than 12 meters in length when aground shall not be required to exhibit the lights or shapes prescribed in sections (4)(a) and (b) of this rule. (7) A vessel of less than 20 meters in length, when at anchor in a special anchorage area designated by the United States Secretary of Transportation, shall not be required to exhibit the anchor lights and shapes required by this rule.