33 CFR 83.15 : Navigation And Navigable Waters (§ 1.01-1 To Parts 404-499) — (§ 1.01-1 To Parts 121-124) — Coast Guard, Department Of Homeland Security (§ 1.01-1 To Parts 121-124) — Inland Navigation Rules (§ 83.01 To § 90.7) — Rules (§ 83.01 To § 83.38) — Steering And Sailing Rules (§ 83.04 To § 83.19) — Conduct Of Vessels In Sight Of One Another (§ 83.11 To § 83.18) — Crossing situation (Rule 15).

(a) When two power-driven vessels are crossing so as to involve risk of collision, the vessel which has the other on her starboard side shall keep out of the way and shall, if the circumstances of the case admit, avoid crossing ahead of the other vessel.

(b) Notwithstanding paragraph (a) of this Rule, on the Great Lakes, Western Rivers, or water specified by the Secretary, a power-driven vessel crossing a river shall keep out of the way of a power-driven vessel ascending or descending the river.