Chesapeake Bay Tides and Currents, Explained
The Chesapeake's tides are gentle by ocean standards — but its currents are not always, and both reward a minute of planning.
How big are Bay tides?
Tidal range runs about 1–2 ft through most of the Bay, growing toward 3 ft near the ocean entrance at Norfolk and shrinking to a foot or so mid-Bay. The tide is semidiurnal: two highs and two lows a day, roughly 6¼ hours apart. Wind matters as much as the moon here — a sustained northerly can push a foot of water out of the upper Bay.
Where currents bite
Open-Bay currents are typically under a knot, but they concentrate wherever water squeezes: Kent Narrows, the mouths of the big rivers, and around points and bridge piers. Two knots against you halves a small sailboat's progress — time the narrows for slack when you can.
Using the predictions on BayCharts
Enable the tide layer and tap any T station for the next highs and lows, or a C station for flood, ebb and slack times with speeds in knots. The data comes live from NOAA CO-OPS — the same predictions in the official tables.
Rules of thumb: leave a rising tide under you when crossing thin water; remember depths are charted at low water (MLLW), so mid-tide usually gives you a bonus foot; and check the current station nearest a narrows, not just the tide station nearest your slip — they are different things.
See today's tides on the chart →