Hydrologic Conditions (Streamflow, Salt Front & Groundwater)
Tides in the DRB

The Delaware River Estuary extends 133 miles from Morrisville, Pa./Trenton, N.J. south to Lewes, Del./Cape May, N.J., where the Delaware Bay meets the Atlantic Ocean. Because the river is not dammed from the ocean, it experiences regular tidal changes anywhere from six to ten feet!

This 24-hr time-lapse video was taken in September 2020 at Philadelphia's Washington Avenue Green, which is one of DRBC's bacteria monitoring sites. The camera took one photo/minute, and the playback is 30 frames/second.


Tide Predictions

Because the Delaware Estuary is tidal, it is important to know when tides are predicted.

Tide predictions are available up to two years in advance from the National Oceanic and Atmospheric Administration's (NOAA) Tide Predictions website. This site provides a graphical display, as well as tabular listing, of the predicted tides, has options for downloading or printing, and a number of other features.

Additional Links of Interest: