New rules limiting clean water protections ignore stream science

What happens to part of a river network affects all of it.

 

On Dec. 11, the Trump administration announced plans to cut back the number of wetlands and creeks protected under the Clean Water Act, which regulates water pollution in the U.S. The new rules would leave about half the nation’s wetlands and all of its ephemeral streams — those waterways, common in the West, that flow only after rainfall or snowmelt — without federal safeguards.

The proposed guidelines, which will almost certainly face years of lawsuits, are a stark departure from how previous administrations have interpreted the act — and a sharp divergence from research on how to protect clean water. The Environmental Protection Agency and the Army Corps of Engineers argued that the new rules were informed by science. But the agencies did not conduct a new scientific assessment of which waterways the Clean Water Act should cover; instead, they relied on a comprehensive report prepared by the EPA in 2015. That report, on how streams and wetlands are connected to downstream waters, highlights the importance of the very waterways the new guidelines would leave unprotected.

High Country News recently caught up with Ellen Wohl, a river researcher and professor at Colorado State University who served on the scientific review committee for the 2015 EPA report, to find out how scientists view the new guidelines.

Sections of the Little Colorado River in northern Arizona are ephemeral, flowing most frequently during the spring to accommodate snowmelt runoff or during the summer monsoon season. In this view, the river is at flood stage, with water cascading over the falls.

High Country News: Does this proposed rule match what researchers know is important for protecting clean water?

Ellen Wohl: Absolutely not. It’s diametrically opposed to how the scientific community understands rivers as ecosystems, and river function.

Most of us, when we think about rivers, we think of the type of river that we would fish or boat on, or really big rivers; we don’t think of the river that we could jump across. But if you spread your hand and you look at it, and you say, ‘I don’t care about the little stuff, so I’m going to cut off the first two joints of every finger,’ and you’ve got a palm and some stubs left, your hand’s not going to be very functional.

Wohl said that when scientists study streams, they don’t just consider the main channel; they think of “the entire river network.”
Courtesy Ellen Wohl

It’s the same thing with a river network. Those small streams, which constitute 70 to 80 percent of the total channel length in any river network, are critical to the functioning of the whole system. Any spot on a particular river is connected to what’s underneath the ground, it’s connected to what’s on the adjacent hill slopes, it’s connected to what’s up- and downstream.

HCN: Can you give me an example?

EW: Nitrate pollution is a big, big issue around the world, including much of the Western U.S. One effect of having too much is the big dead zones … off the near-shore area of most major rivers. We have reduced the ability of rivers to process that nitrate, to take it up biologically and keep it from just flowing downstream.

A lot of that nitrate uptake occurs in the little rivers. Rivers can take up nitrate if they are physically complex, (if they have) secondary channels, abandoned channels, a floodplain, floodplain wetlands. So if you bury them, if you pave them, if you channelize them, if you dewater them — if you do all the things that you cannot do as much if they’re protected under the Clean Water Act — you lose all that.

HCN: The new rule would strip protections from wetlands that don’t have a surface connection to a protected river or lake — that are only connected via groundwater, for example. Does it make sense to treat wetlands that have a surface connection differently than ones that don’t?

EW: Scientifically, no. They’re disconnected in the ways we can see on the surface, but there are subsurface connections. They don’t sit there in isolation like some special creation; they are integral to the functioning of the whole watershed and the river network. Those disconnected surface wetlands are vital ecologically for a wide variety of organisms, from migratory birds to the communities that live (there) year-round, and they are not disconnected in the ways that matter.

HCN: Is there a specific place or landscape you could point to where these little streams and subsurface connections are particularly important?

EW: Pawnee National Grasslands. It’s what all of eastern Colorado would look like without irrigation: It’s shortgrass prairie, bunchgrasses, small sagebrush, prickly pear cacti. Many of the channels are intermittent (streams with sections that are sometimes dry), so they’ll have what the biologists call refuge pools, places that retain water throughout the year.

The plains fish … are mostly small-bodied fish. They’re “super fish” in that they can survive things that kill a lot of other fish: very high water temperatures, low dissolved oxygen. They’re tough, but they can’t survive desiccation. So, if you lose protection for some of these small channels, the refuge pools will dry up — and that will be the end of these species.

Though waterways in Colorado’s Pawnee National Grassland don’t consistently flow, they are essential to the ecosystem.
Tim Szlachetka/Flickr CC

HCN: Do you see any reason for hope?

EW: I’d like to get people to think about rivers in a broader sense, of not just the pretty streams that we do whitewater rafting and trout fishing on, but as the whole river network. They are an integrated ecosystem, and they’re important. Is there reason for hope? I see evidence that people are starting to think that way more.

HCN: Like what?

EW: The regional example I’ve used is the Pacific Northwest. They have a very different attitude toward rivers than anywhere else in the U.S., and I think it’s because of the focus on salmon. They get it — a salmon can’t survive without a watershed. It needs to migrate upstream, it needs spawning habitat, it needs rearing habitat. They’ve made the connection between a particular fish that everybody is excited about and the whole watershed.

Even though there are these national rules, and even if they go into effect, there are things you can do locally to protect your local river. If people feel strongly about this, I would encourage them to become active in, or form, local watershed groups. Then you get the immediate benefits of a clean, healthy river. So adopt a river, and care for it.

This interview has been edited for clarity and length.

Emily Benson is an assistant editor at High Country News, covering Alaska, the Pacific Northwest and the Northern Rockies. Email her at [email protected] or submit a letter to the editor

High Country News Classifieds
  • ATTORNEY AD
    Criminal Defense, Code Enforcement, Water Rights, Mental Health Defense, Resentencing.
  • LUNATEC HYDRATION SPRAY BOTTLE
    A must for campers and outdoor enthusiasts. Cools, cleans and hydrates with mist, stream and shower patterns. Hundreds of uses.
  • LUNATEC ODOR-FREE DISHCLOTHS
    are a must try. They stay odor-free, dry fast, are durable and don't require machine washing. Try today.
  • PROFESSIONAL GIS SERVICES
    Custom Geospatial Solutions is available for all of your GIS needs. Affordable, flexible and accurate data visualization and analysis for any sized project.
  • FREE RANGE BISON AVAILABLE
    Hard grass raised bison available in east Montana. You harvest or possible deliver quartered carcass to your butcher or cut/wrapped pickup. Contact Crazy Woman Bison...
  • CONSERVATION ASSOCIATE - OKANOGAN LAND TRUST (NORTH CENTRAL WA)
    Do you enjoy rural living, wild places, and the chance to work with many different kinds of people and accomplish big conservation outcomes? Do you...
  • CARDIGAN WELSH CORGIS
    10 adorable, healthy puppies for sale. 4 males and 6 females. DM and PRA clear. Excellent pedigree from champion lineage. One Red Brindle male. The...
  • A CHILDREN'S BOOK FOR THE CLIMATE CRISIS!!
    "Goodnight Fossil Fuels!" is a an engaging, beautiful, factual and somewhat silly picture book by a climate scientist and a climate artist, both based in...
  • DIGITAL ADVOCACY & MEMBERSHIP MANAGER
    The Digital Advocacy & Membership Manager will be responsible for creating and delivering compelling, engaging digital content to Guardians members, email activists, and social media...
  • DIGITAL OUTREACH COORDINATOR, ARIZONA
    Job Title: Digital Outreach Coordinator, Arizona Position Location: Phoenix or Tucson, AZ Status: Salaried Job ID Number: 52198 We are looking for you! We are...
  • DESCHUTES LAND TRUST VOLUNTEER PROGRAM MANAGER
    The Deschutes Land Trust is seeking an experienced Volunteer Program Manager to join its dedicated team! Deschutes Land Trust conserves and cares for the lands...
  • ASSOCIATE DIRECTOR OF DEVELOPMENT
    The Nature Conservancy in Wyoming seeks an experienced fundraiser to join our team. We're looking for a great communicator who is passionate about conservation and...
  • INDIAN COUNTRY FELLOWSHIP
    Western Leaders Network is accepting applications for its paid, part-time, 6-month fellowship. Mentorship, training, and engaging tribal leaders in advancing conservation initiatives and climate policy....
  • MULESHOE RANCH PRESERVE MANAGER
    The Muleshoe Ranch Preserve Manager develops, manages, and advances conservation programs, plans and methods for large-scale geographic areas. The Muleshoe Ranch Cooperative Management Area (MRCMA)...
  • ARTEMIS PROGRAM MANAGER
    Founded in 1936, the National Wildlife Federation (NWF or Federation) is America's largest and most trusted grassroots conservation organization with 52 state/territorial affiliates and more...
  • ASSISTANT OR ASSOCIATE PROFESSOR OF ENVIRONMENTAL HUMANITIES
    Assistant or Associate Professor of Environmental Humanities Whitman College The Environmental Humanities Program at Whitman College seeks candidates for a tenure-track position beginning August 2023...
  • EXECUTIVE DIRECTOR
    High Country Conservation Advocates (HCCA) in Crested Butte, CO is seeking an enthusiastic Executive Director who is passionate about the public lands, natural waters and...
  • ASSOCIATE DIRECTOR OF VOLUNTEER PROGRAMS
    Are you passionate about connecting people to the outdoors? The Pacific Crest Trail Association (PCTA) is looking for someone with volunteer management experience to join...
  • EXECUTIVE DIRECTOR
    The conservation non-profit Invasive Species Action Network seeks an executive director. We are focused on preventing the human-caused spread of invasive species by promoting voluntary...
  • HIGH COUNTRY NEWS EDITORIAL INTERNS
    High Country News, an award-winning magazine covering the communities and environment of the Western United States, is looking for its next cohort of editorial interns....