StacksVerified U.S. regulatory reference

33 CFR §149.535

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
In addition to obstruction lights, the tallest platform of a deepwater port must have a lit rotating beacon that distinguishes the deepwater port from other surrounding offshore structures. The beacon must:
  1. (a)Have an effective intensity of at least 15,000 candela;
  2. (b)Flash at least once every 20 seconds;
  3. (c)Provide a white light signal;
  4. (d)Operate in wind speeds of up to 100 knots at a rotation rate that is within 6 percent of the operating speed displayed on the beacon;
  5. (e)Have one or more leveling indicators permanently attached to the light, each with an accuracy of ±0.25 ° or better; and
  6. (f)Be located:
    1. (1)At least 60 feet (about 18.3 meters) above mean high water;
    2. (2)Where the structure of the platform, or equipment mounted on the platform, does not obstruct the light in any direction; and
    3. (3)So that it is visible all around the horizon.