The Rule of 12ths: a way to gauge tidal dangers on the Columbia

from The Ship Report · host Joanne Rideout

Today we’ll talk about a useful guideline for navigating in heavily tidal waters like the Columbia. It’s called the Rule of 12ths. The Rule of 12ths divides the tidal cycle into segments, and shows when the most active times are happening. It offers a useful pattern to determine when the falling or rising tide will […] The post The Rule of 12ths: a way to gauge tidal dangers on the Columbia appeared first on The Ship Report.

Episode metadata supplied by the publisher feed · Published Aug 11, 2026

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