Coastal Marsh

Habitat Type

The refuge contains 91,173 acres of fresh, intermediate, and brackish marsh interspersed with low prairie ridges, man-made levees, meandering bayous, and canals. Traditionally, the area fluctuates from being a predominantly fresh marsh to a predominantly brackish marsh and reverts back from brackish to fresh, dependent upon weather cycles and precipitation.

Marshes also improve water quality by acting as a sink to filter pollutants and sediment from the water that flows through them. Marshes (and other wetlands) are able to absorb water during periods of heavy rainfall and slowly release it into waterways and therefore reduce the magnitude of flooding. The pH in marshes tends to be neutral to alkaline, as opposed to bogs, where peat accumulates under more acid conditions.

Facts About Coastal Marsh

  • Can change between fresh and brackish
  • Helps filter the water