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Thanks to a group of determined citizens and a legal principle that dates back to the Roman Empire, fences are coming down along the Hudson River, allowing people access to the riverfront from the George Washington Bridge to the shores of Staten Island.

Starting in the 1980s, high-rise development boomed along the New Jersey shore of New York Harbor. The developers were allowed to build right down to the shoreline on the condition that they construct walkways to give the public access to the water. When they reneged on their promise, citizens groups, led by New York/New Jersey Baykeeper, sued.

They won their case in 1999, setting in motion construction of the Hudson River Walkway, which, when completed, will run for more than 18 miles along the New Jersey riverfront. The victory helped launch an ongoing campaign to clean up industrial and urban water pollution and protect streams and wetlands throughout the Hudson-Raritan Estuary, one of the country’s most densely populated waterways.

At the heart of Baykeeper’s strategy was a centuries-old concept called the public trust doctrine .

The public trust doctrine holds that “By the law of nature, these things are common to mankind: the air, running water, the sea, and consequently the shores of the sea,” explains environmental attorney Jim Olson, quoting a translation from the original Latin. Olson has been advocating for environmental protection in the Great Lakes region since the 1970s. “The deep intent,” he says, “is that these things are not owned by anyone but that they are held in trust for the benefit of all.” This notion helped give rise to the idea of the public commons —places and natural resources that are shared by all citizens.

Waterkeepers all across the country are using the public trust doctrine to protect water quality and public access to local water.

In the United States, the doctrine has been used to affirm that we the people share in common America’s rivers, streams, lakes, wetlands, and coastal waters. It says that water cannot be deemed private property and that our right to access and use these waterways must be maintained.

While the origins of the public trust doctrine are ancient, activists are now invoking its tenets to tackle some very modern threats—including waterfront high-rises and other urban and industrial developments that physically block public access to a river, lake, or coastal area. The doctrine is also proving instrumental in fighting water pollution and stopping commercial water bottlers from selling public water.

“People may not have heard of the public trust doctrine, but they have an innate sense of what it means,” says Debbie Mans, executive director of NY/NJ Baykeeper.

“We were able to rally great neighborhood and community support [for our efforts and] people inherently understood this idea.”

Baykeeper is a member of the Waterkeeper Alliance, founded in 1999 by environmental attorney Robert F. Kennedy Jr. and fellow environmental advocates. The Alliance has grown into an international network of nearly 200 locally based groups of citizen “Riverkeepers” and “Waterkeepers” who work together to protect waterways. The movement builds grassroots advocacy by connecting people to their local rivers and coastal waters. Waterkeepers also defend citizens’ rights to clean and accessible water, whether it’s an industrialized urban river or a mountain stream.

Waterkeepers all across the country are now using the public trust doctrine to protect water quality and public access to local water. “If I go out on the river,” says Brett VandenHeuvel, executive director of Columbia Riverkeeper, “I should be able to catch fish and eat them and swim in the river without having my access impeded.”

The New Western Water Culture

In the rugged high country where the Cache La Poudre River flows from Colorado’s Rocky Mountains through the city of Fort Collins, activists are using the Waterkeeper strategy to fight a huge dam and reservoir project. Poudre Waterkeeper is building local support by helping residents get to know their river. “Cities have been establishing kayak parks, and Fort Collins now has a bike path along the Poudre River that’s become a center of the city’s recreation,” says Gary Wockner, the group’s executive director.

Nearly 90 percent of the Poudre is currently diverted or dammed. Several more large dams and reservoirs have been proposed for the basin by the Northern Colorado Water Conservancy District. Â鶹Éçʼþ dams would further reduce river flow; harm aquatic life, such as native fish and insects; worsen pollution; and cause sediment buildup—all of which threaten drinking water, recreation, and local fishing.