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.
Source:
Rule 250-011-0160 — Anchored Vessels and Vessels Aground, https://secure.sos.state.or.us/oard/view.action?ruleNumber=250-011-0160.