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Discover the Chesapeake

The Chesapeake Bay - the largest estuary in the United States - is an incredibly complex ecosystem that includes important habitats and food webs. The Bay and its rivers, wetlands and forests provide homes, food and protection for diverse groups of animals and plants. Fish of all types and sizes either live in the Bay and its tributaries year-round or visit its waters as they migrate along the East Coast.

Bay 101

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Bay 101: Wetlands

Wetlands are important wildlife habitat that also help improve water quality downstream

The Chesapeake Bay Watershed

A watershed is an area of land that drains to a particular river, lake, bay or other body of water. Watersheds are sometimes called “basins” or "drainage basins."

We all live in a watershed. Some watersheds, like that of your local stream or creek, are small. Others, like the Chesapeake Bay watershed, are very large. Learn more about the Chesapeake Bay watershed.

The Bay Ecosystem

An ecosystem is a complex set of relationships among living and non-living things. Air, water, soil, sunlight, plants and animals – including humans – make up an ecosystem. Ecosystems can be as tiny as a patch of dirt in your backyard, or as large as the entire Chesapeake Bay watershed.

The Bay Ecosystem

The Chesapeake Bay, the largest estuary in the United States, is an extremely productive and complex ecosystem. The Bay ecosystem consists of the Bay itself, its local rivers and streams, and all the plants and animals it supports. Learn more about the Chesapeake Bay ecosystem.

Critter Of The Month

Loggerhead Turtle
Caretta caretta

Named for its large head and powerful jaw, the loggerhead turtle visits the Chesapeake Bay from May to November to forage and will nest on nearby barrier islands.

Chesapeake History

2014

2014
  • The Chesapeake Executive Council signs the Chesapeake Bay Watershed Agreement, which contains goals and outcomes that will guide conservation and restoration across the watershed. For the first time, the Bay’s headwater states commit to those goals that reach beyond water quality.

2013

2013
  • A federal judge rules that the U.S. Environmental Protection Agency can set pollution limits for the Chesapeake Bay, thus upholding the Total Maximum Daily Load (TMDL) that was challenged in court in 2011.

2012

2012
  • Harris Creek becomes the first target of the oyster restoration goals set forth in the Chesapeake Bay Executive Order: to restore oyster populations in 20 Bay tributaries by 2025. In this Choptank River tributary, existing reefs will be studied, new bars will be built and spat-on-shell will be planted.

2011

2011
  • The U.S. Environmental Protection Agency issues a new Municipal Separate Storm Sewer Permit to the District of Columbia. It is the first of its kind to incorporate green infrastructure into its requirements, setting a national model for stormwater management.

2010

2010
  • Maryland, Virginia and New York ban phosphates in dishwasher detergent to lower phosphorous pollution in local waterways.
  • The U.S. Environmental Protection Agency establishes the Total Maximum Daily Load to limit the amount of pollutants that can enter the Chesapeake Bay.
  • The Bay Program launches ChesapeakeStat to improve communication about restoration goals, progress and funding.

Bay FAQ


What does "Chesapeake" mean?


How does air pollution affect Chesapeake Bay health?


What are forest buffers?


What are endocrine disruptors?


Why is dissolved oxygen important?


What is scouring?


What is an airshed?


What is the deepest part of the Chesapeake Bay?


How do forest buffers protect water quality?


How does sediment affect the Bay?

See more FAQs.

Bay Glossary

Contaminant

Anything that makes the water or land impure, unclean or polluted.

Tributary

A creek, stream or river that flows into a larger body of water. For example, the Susquehanna, Potomac and James rivers are tributaries of the Chesapeake Bay.

Substrate

The surface or material that an organism lives on or in. For example, oyster reefs provide hard substrate for invertebrates to attach themselves to.

Year class

All of the fish of any species that hatched during one annual spawning period.

Gastropod

The largest class of mollusks. Gastropods have a one-piece shell (univalve) or no shell at all, and travel by using a single large muscular foot. Snails and slugs are gastropods.

Pollinate

To fertilize a plant by transferring pollen grains from a male plant structure to a female plant structure.

Aquatic

 Living in water.

Zoea

A tiny, semi-transparent larval blue crab.

See more bay terms.

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