19. The Salt Front on the Hudson River Estuary
The Hudson River's Salt Front moves with the seasons
The leading edge of dilute seawater coming up the river is called the salt front. In years with normal patterns and amounts of precipitation, the salt front reaches Newburgh Bay in late summer. During drought years, the front can go as far upriver as Poughkeepsie. Spring runoff or large rainstorms can push the salt front as far south as the Tappan Zee or even Manhattan.
The mixture of fresh water and salty ocean water is called brackish water.
