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

Young Professional

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 and Environmental 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 and Environmental Planner

Get top-rated, practical training for planners

"Planetizen federal action tracker" logo superimposed over black and white image of US Capitol dome.

Planetizen Federal Action Tracker

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

September 16, 2026 - Zachary Whalen

Overlapping highways

The state-sanctioned urbicide of Austin

People don’t kill cities. Freeways do.

September 8, 2026 - Benjamin Schneider

The Hoover Dam blocking the Colorado River. The river's water level is noticeably low. The cliffs surrounding the blue water are brown and jagged.

US to reduce Colorado River water deliveries to Mexico

A new Colorado Treaty amendment reduces Mexico’s Colorado River water allocation by 250,000 acre feet.

September 11, 2026 - The Arizona Republic

A cluster of wind turbines beneath a stormy sky, above a forest where the leaves are beginning to change colors.

5 New England states march closer to 800 megawatt wind energy project

Securing federal approval for the project may be complicated under the Trump administration, which has historically been hostile towards domestic wind power.

5 hours ago - Inside Climate News

People boarding a bus on Maryland's Orange Route.

Baltimore to break ground on $50 million Transit Priority Project

The project will bring faster bus trips, safer streets and better bike connections to Baltimore.

6 hours ago - Mass Transit

A brick building with a circular sign with the Airbnb logo hanging off of it.

Airbnb launches $250 million 'last-dollar financing' housing accelerator, makes first investment in Austin

The company will put $6.4 million towards affordable housing development in Texas’ capital.

7 hours ago - Smart Cities Dive

FREE Course: Walkable City 1: Why Walkability?

After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.

Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold

The course focuses on the opportunities and imperatives that shape reinvention of mall sites.