2018's Most Endangered Rivers

The American Rivers advocacy organization this week released their annual list of most endangered rivers in the United States.

2 minute read

April 11, 2018, 7:00 AM PDT

By James Brasuell @CasualBrasuell


Big Bend National Park

The Rio Grande River running through Santa Elena Canyon at Big Bend National Park in Texas. | Bill Kennedy / Shutterstock

American Rivers announced the Most Endangered Rivers of 2018 list on April 10, raising the alarm about the potential for catastrophic developments affecting rivers in eight states. Several rivers are cited specifically for the potential of the Trump Administration and Congress to decide the future of the river.

Included on the list are the following rivers and the state where the primary threat is located:

  • Big Sunflower River, Mississippi
  • Rivers of Bristol Bay, Alaska
  • Boundary Waters, Minnesota
  • Lower Rio Grande, Texas
  • South Fork Salmon River, Idaho
  • Mississippi River Gorge, Minnesota
  • Smith River, Montana
  • Colville River, Alaska
  • Middle Fork Vermilion River, Illinois
  • Kinnickinnic River, Wisconsin

The first river on the list is threatened by the Yazoo Pumps Project, according to American Rivers, which would "damage more than 200,000 acres of wetlands in the Big Sunflower River watershed in the heart of the Mississippi River Flyway. More than 450 species of fish and wildlife, including the Louisiana black bear, rely on the wetlands habitat that would be drained by the project."

American Rivers also lists President Trump's proposed border wall as the threat facing the Lower Rio Grande. In addition to the announcement of the 2018 list, see also a page set up with portals to more information on each of the endangered rivers. The full report [pdf] is also available online.

Several media outlets and advocates have also picked up the new online.

See also Planetizen coverage of previous lists.

Tuesday, April 10, 2018 in American Rivers

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

Rendering of Shirley Chisholm Village four-story housing development with person biking in front.

San Francisco's School District Spent $105M To Build Affordable Housing for Teachers — And That's Just the Beginning

SFUSD joins a growing list of school districts using their land holdings to address housing affordability challenges faced by their own employees.

June 8, 2025 - Fast Company

Yellow single-seat Japanese electric vehicle drivign down road.

The Tiny, Adorable $7,000 Car Turning Japan Onto EVs

The single seat Mibot charges from a regular plug as quickly as an iPad, and is about half the price of an average EV.

June 6, 2025 - PC Magazine

People riding bicycles on separated bike trail.

With Protected Lanes, 460% More People Commute by Bike

For those needing more ammo, more data proving what we already knew is here.

1 hour ago - UNM News

Bird's eye view of half-circle suburban street with large homes.

In More Metros Than You’d Think, Suburbs are Now More Expensive Than the City

If you're moving to the burbs to save on square footage, data shows you should think again.

3 hours ago - Investopedia

Color-coded map of labor & delivery departments and losses in United States.

The States Losing Rural Delivery Rooms at an Alarming Pace

In some states, as few as 9% of rural hospitals still deliver babies. As a result, rising pre-term births, no adequate pre-term care and "harrowing" close calls are a growing reality.

June 15 - Maine Morning Star