Merrimack River at Lawrence — MA, United States

Tide times & tide chart

Mostly seasonal — the yearly change in water level here is about 100 times the daily tide.

-0.9 ft11:30am-0.8 ft6:33pmNow
Tide predictions for Merrimack River at Lawrence, computed from harmonic constituents. High -0.8 feet on Mon 19 Oct 2026 at 00:00, low -0.9 feet on Mon 19 Oct 2026 at 11:30, above MLLW, the chart datum.
↑7:02am↓5:55pm

Predictions are not observations — conditions vary with weather and river flow. Not for navigation.

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Tide times for the next 7 days

Mon 19 Oct 2026 through Sun 25 Oct 2026. All times are local to Merrimack River at Lawrence (America/New_York). Heights are in feet above MLLW.
DayTideTimeHeight
Mon 19 Oct 2026Low-0.9 ft
Mon 19 Oct 2026High-0.8 ft
Tue 20 Oct 2026Low-0.9 ft
Tue 20 Oct 2026High-0.8 ft
Wed 21 Oct 2026Low-0.9 ft
Wed 21 Oct 2026High-0.9 ft
Wed 21 Oct 2026Low-0.9 ft
Wed 21 Oct 2026High-0.9 ft
Thu 22 Oct 2026Low-1.0 ft
Thu 22 Oct 2026High-0.9 ft
Thu 22 Oct 2026Low-1.0 ft
Thu 22 Oct 2026High-0.9 ft
Fri 23 Oct 2026Low-1.0 ft
Fri 23 Oct 2026High-0.9 ft
Sat 24 Oct 2026Low-1.0 ft
Sun 25 Oct 2026High-0.9 ft
Sun 25 Oct 2026Low-1.0 ft

Station facts

Position
42.7048° N, 71.1531° W
Time zone
America/New_York
Datum
MLLW datum · computed from harmonic constituents
Source
Harmonic constituents from TICON-4
Region
MA, United States

Heights are measured above chart datum. A negative height means there is that much less water than the charted depth shows.

Slackwater database (https://github.com/openwatersio/slackwater-database). Source: Hart-Davis, M., Dettmering, D., Seitz, F. (2025), TICON-4: TIdal CONstants based on GESLA-4 sea-level records, SEANOE, https://doi.org/10.17882/109129. Licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Modified: see https://github.com/openwatersio/slackwater-database#modifications-to-source-data

How we check predictions — dated samples and their limits.

Nearby

All tide stations