{"data":{"id":"us/33-cfr-401.10","jurisdiction":"us","citation":"33 CFR 401.10","heading":"Mooring lines.","body":"(a) Mooring lines shall:\n(1) Be of a uniform thickness throughout their length;\n(2) Have a diameter not greater than 28 mm for wire line and not greater than 64 mm for approved synthetic lines;\n(3) Be fitted with a hand spliced eye or Flemish type mechanical spliced eye of not less than 2.4 m long for wire lines and 1.8 m long spliced eye for approved synthetic lines;\n(4) Have sufficient strength to check the vessel; and\n(5) Be arranged so that they may be led to either side of the vessel as required.\n(6) Be certified and a test certificate for each mooring line containing information on breaking strength, material type, elongation and diameter shall be available onboard for inspection.\n(b) Unless otherwise permitted by an officer, vessels greater than 200 m shall only use wire mooring lines with a breaking strength that complies with the minimum specifications set out in the table to this section shall be used for securing a vessel in lock chambers.\n(c) [Reserved]\n(d) Notwithstanding paragraphs (a) through (c) of this section, nylon line is not permitted.\nTable 1 to Paragraph (d)\nOverall length of ships Length of mooring line (m) Breaking strength (MT)\n40 m or more but not more than 60 m 110 10\nMore than 60 m but not more than 90 m 110 15\nMore than 90 m but not more than 120 m 110 20\nMore than 120 m but not more than 180 m 110 28\nMore than 180 m but not more than 200 m 110 31\nMore than 200 m but not more than 225.5 m 110 35\nElongation of synthetic lines shall not exceed 20%.\n(e) Hand held synthetic lines if permitted by the Manager or Corporation shall meet the criteria in paragraph (a) of this section and shall have a minimum length of not less than 65 meters.","path":["Title 33—Navigation and Navigable Waters","CHAPTER IV—GREAT LAKES ST. LAWRENCE SEAWAY DEVELOPMENT CORPORATION, DEPARTMENT OF TRANSPORTATION","PART 401—SEAWAY REGULATIONS AND RULES","Subpart A—Regulations"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-33.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:35Z","sha256":"a9c02460ed9a2206a5359ac4a9b68685c55c66c5c2782f28f7343b94e9ac55b9","source_id":"us-cfr","stale":true,"prev":"us/33-cfr-401.9","next":"us/33-cfr-401.11"},"notice":"GroundRules: Original legal text. Not legal advice."}