The Hudson River's breadth between Manhattan and New Jersey changes dramatically by location:
The river transitions from a confined glacial fjord in the north to a broad, tidally influenced estuary near the ocean. Bathymetry, glacial history, and tidal dynamics all shape the channel.
These widths affect bridge engineering, shipping navigation, and even microclimates—wider sections moderate temperatures more effectively. The GW Bridge's relatively narrow span made its 1931 construction feasible with then-available technology.