America's Most Endangered Waterways

In time for Earth Day, American Rivers has released its annual list of the country's most threatened rivers. Topping this year's list is the Colorado River, a waterway so dammed, diverted and over-tapped that it ultimately "dries to a trickle."

1 minute read

April 22, 2013, 11:00 AM PDT

By Jonathan Nettler @nettsj


"Each year American Rivers selects 10 rivers as our most endangered from a broad array of nominations from groups and individuals across the country," writes Jeff Wiedner. This year's list, which includes the Flint River in Georgia, Little Plover River in Wisconsin, and the San Saba River in Texas, were selected because they met three criteria: "1) A major decision in the coming year that the public can help influence; 2) The significance of the river to people and wildlife; 3) The magnitude of the threat to the river and its communities, especially in light of a changing climate".

Topping the list is the Colorado River, "the lifeblood of the American Southwest, providing drinking water for over 36 million people across seven states, irrigating 15 percent of our nation’s agriculture output, and supporting a $26 billion recreation economy."

"As Americans, we are lucky to have this river in our proverbial backyard," says Wiedner. "It is one of the most recognized and visited rivers in the United States, with millions of people flocking to its banks each year. But a century of water management policies and practices promoting wasteful water use have put the river at a critical crossroads."

Tuesday, April 16, 2013 in Take Part

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

June 11, 2025 - Diana Ionescu

Metrorail train pulling into newly opened subterranean station in Washington, D.C. with crowd on platform taking photos.

Congressman Proposes Bill to Rename DC Metro “Trump Train”

The Make Autorail Great Again Act would withhold federal funding to the system until the Washington Metropolitan Area Transit Authority (WMATA), rebrands as the Washington Metropolitan Authority for Greater Access (WMAGA).

June 2, 2025 - The Hill

Large crowd on street in San Francisco, California during Oktoberfest festival.

The Simple Legislative Tool Transforming Vacant Downtowns

In California, Michigan and Georgia, an easy win is bringing dollars — and delight — back to city centers.

June 2, 2025 - Robbie Silver

Street scene in Kathmandu, Nepal with yellow minibuses and other traffic.

The Small South Asian Republic Going all in on EVs

Thanks to one simple policy change less than five years ago, 65% of new cars in this Himalayan country are now electric.

30 minutes ago - Fast Company

Bike lane in Washington D.C. protected by low concrete barriers.

DC Backpedals on Bike Lane Protection, Swaps Barriers for Paint

Citing aesthetic concerns, the city is removing the concrete barriers and flexposts that once separated Arizona Avenue cyclists from motor vehicles.

2 hours ago - The Washington Post

Bird's eye view of studio apartment design.

In These Cities, Most New Housing is Under 441 Square Feet

With loosened restrictions on “micro-housing,” tiny units now make up as much as 66% of newly constructed housing.

4 hours ago - Smart Cities Dive