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Growth of human impact on the Chesapeake Bay during the past 125 years
The replacement of railroad ties removes an estimated 15 to 20 million acres of eastern forests. A dramatic drop in oyster populations starts to affect Chesapeake Bay health, and state and federal law
1900 - 1909
Baltimore installs separate wastewater and stormwater systems to filter water before it flows into the Chesapeake Bay.
1910 - 1919
Dermo, a disease that kills oysters, is discovered in the Chesapeake Bay.
1940 - 1949
The 4.2-mile Chesapeake Bay Bridge is built, opening Maryland's Eastern Shore to development. Across the region, developers drain and fill wetlands to build new houses, stores and office buildings. MS
1950 - 1959
The 17.4-mile Chesapeake Bay Bridge-Tunnel opens, connecting Virginia Beach with Virginia's Eastern Shore. The Chesapeake Bay Foundation is formed
1960 - 1969
An increase in polluted runoff and damage from Hurricane Agnes destroy underwater grass beds in the Chesapeake Bay. The Clean Water Act is passed.
1970 - 1979
A Maryland ban on phosphate-containing laundry detergent reduces the amount of phosphorous flowing from wastewater treatment plants into the Chesapeake Bay. Maryland and Virginia lift the ban on strip
1980 - 1989
The Local Government Partnership Initiative is signed to provide assistance to the 1,650 local governments in the Chesapeake Bay watershed.
1990 - 1999
Chesapeake 2000 is signed, establishing more than 100 goals to reduce pollution and restore habitats, protect living resources and promote sound land use, and engage the public in restoration.
2000 - 2009
The U.S. Environmental Protection Agency establishes the Total Maximum Daily Load to limit the amount of pollutants that can enter the Chesapeake Bay.
2010 - 2019
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