Most Americans live within a mile of a river or a stream. We rely on rivers for drinking water, irrigation, and more. Providing a home for fish, plants, animals, and people, rivers are essential for the survival of many species—including our own.
Rivers: Lifelines to the World
Rivers provide our communities with economic, ecological, and cultural value. Roughly 3.5 million miles of rivers and tributaries in the United States connect us to the sea, even if we live far inland.
River habitats vary from high, stony streams, flowing channels for ships and boats, to shallow wetlands. Rivers have striking regional differences that create distinct habitats. Compare the rapid, rocky Colorado to South Carolina’s sleepy, green Santee, or the forested, winding Ohio. A river bed may be stony or soft, lush with underwater vegetation, murky and slow or cold and clear, but each provides an ideal environment for different species and different life stages.
Rivers have three distinct habitat areas:
- River beds, or the water channel itself.
- River banks, called the “riparian zone.” These include the land, trees, and water-loving animals and plants along the channel.
- Floodplains, or the low, flat land spreading out from the channel. This area periodically floods during heavy rains and snow melt. Sometimes floodplains stay soggy for a long time, creating rich wetland habitat.
The Value of River Habitat
Communities depends on rivers for:
- Food—irrigating crops.
- Electricity—generating hydro-electric power.
- Transportation—bringing grain, coal, ore, and imports to market.
- Recreation and tourism—providing significant economic boost to waterfront areas.
- Clean water—sixty percent of our drinking water comes from American rivers.
- Flood protection—when waters rise, floodplains can absorb large amounts of water. This provides natural flood control for coastal communities, preventing billions of dollars in damages.
Rivers are home to fish and wildlife:
- Freshwater fish like bass, perch, bluegill, and catfish.
- Migratory fish such as alewife, salmon, trout, and striped bass.
- Many invertebrates that provide food for fish.
- Protected, endangered and threatened species.
Trout thrive in highland streams, while catfish lurk near the bottom of slow-moving water. Migrating fish, like salmon, must swim up to cooler, stony beds to reproduce. Floodplains provide calm shallow waters, allowing fish to grow larger before swimming out to sea. Even the smallest fish play an important role. ”Forage fish” swim upriver to multiply, then head out to sea, providing food for commercially valuable seafood.
Challenges for Rivers
People have harnessed the power of rivers throughout history. We’ve built dams for power and levees for shipping, dredged channels for navigation and canals for irrigation. We’ve built towns and cities along banks and washed their wastes down the stream. These uses can all take a toll on a river’s health.
- Dams block migratory fish from returning to their historic spawning grounds, reducing fish populations. Dams also alter the amount of water and sediment traveling downstream, changing living conditions above and below the dam.
- Hard shorelines decrease fish populations and increase water velocity, hastening erosion.
- Digging channels or straightening rivers destroys nearby floodplains and wetlands, and can lead to development where flooding is inevitable.
- Levees may control flooding in one area, but increase flood risk in another. Disconnecting rivers from their floodplain wetlands destroys habitat and increases the risk of extreme flooding and landslides.
- Farm runoff containing fertilizers, herbicides, and pesticides contaminates water with toxins and excess nutrients, causing algal blooms and dead zones.
- Combined stormwater and sewage systems can overflow and pour untreated human waste into rivers, creating disease risk and adding nutrient pollution. The resulting algae overgrowth can be toxic to fish and people.
- Riverside development can reduce shade, which can lead to warmer waters that inhibit reproduction in many species. Hard surfaces also increase pollutant runoff from roadways, parking lots, and roofs.
- Overused rivers can run dry long before they reach the sea, destroying important habitat.
What You Can Do
Many of our daily habits have a negative impact on the health of our rivers, but there are easy things you can do to make a difference.
- Know where your water comes from. Learn about your watershed and how well your water is protected. Support your local watershed organization and join in river cleanup days.
- Reduce hard surface runoff. Disconnect downspouts from sewer systems, install rain barrels, and plant rain gardens. Permeable pavers, gravel beds, and green roofs also reduce runoff.
- Practice smart lawn care. Only apply fertilizer if necessary, use a mulching mower, mow less often, and water more deeply. In dry climates, forget the lawn and create a desert garden with native plants, rocks, and stones.
- Dispose of non-degradable products properly. Don’t pour them down toilets or drains.
- Volunteer as a stream monitor to collect data and contribute to smart water management.
What We Do
NOAA works to protect and restore river habitats through a wide variety of programs and partnerships. We provide scientific expertise to community, state, and partner organizations that monitor water and wildlife. We also provide technical assistance and fund projects that restore healthy habitat. Our process builds community support and attracts multiple sources of funding to ensure ongoing commitment to healthy habitats.
We Protect Habitat
NOAA monitors and studies rivers nationwide to protect vital habitat for a variety of species, including people. Our work includes:
- Monitoring thousands of river gauges nationwide to make the United States a weather-ready nation. These measuring devices provide timely flood forecasts and warnings that protect life and property.
- Collecting pre- and post-restoration data on vegetation, soil, water quality, fish population and migration, water levels, and more.
- Coordinating with volunteer stream monitors who record data and watch for significant changes.
- Providing data including aerial surveys, temperature, nutrient levels, instream flow, and more.
- Developing publications and programs for river constituents to learn about habitat health.
We Restore Habitat
Where river habitat has been disrupted by human activity, we work to repair damage and prevent further harm by:
- Removing dams and other barriers to fish migration. This work restores natural conditions to help fish survive and reproduce.
- Restoring riverbanks and floodplains. This reduces erosion and buffers extreme flooding while creating seasonal habitat for wetland creatures.
- Reconnecting wetlands and estuaries. This restores water movement, improves filtration and provides shelter and food for young fish.
We Partner with State and Local Organizations
We build consensus, broaden our impact, and leverage our efforts by working with non-profit, academic, corporate, and government partners at every level. This work includes:
- Collaborating with the U.S. Environmental Protection Agency, U.S. Fish and Wildlife Service, and state and local organizations to remediate and restore rivers damaged by hazardous waste or oil contamination.
- Providing funding to launch restoration projects that engage multiple partners.
- Sharing knowledge, expertise, and advice for best practices.
- Conducting research that enhances scientific understanding and provides data to universities, NGOs, and the public.
- Offering job skills training and jobs for veterans through conservation corps.
Case Study: Eel River Restoration
The Eel River watershed was once the third largest producer of salmon and steelhead in California. Salmon numbers have declined alarmingly since the 1950s. The longest salmon run in the state, the Eel is a high priority for successfully rebuilding salmon stocks. Coho, Chinook salmon and steelhead are all listed on the Endangered Species List.
The NOAA Restoration Center has taken a watershed approach to the Eel River restoration. To do so, we partnered with Humboldt County Resource Conservation District, Ducks Unlimited, California Department of Fish and Wildlife, the California Conservation Corps, the Eel River Watershed Improvement Group, Mendocino Redwood Company, Pacific Watershed Associates, and other regional and local groups.
Together, we have met these major restoration goals:
Restored 400 acres of estuary habitats. The Salt River Ecosystem Restoration project restored seven miles of river channel near the mouth of the Eel River. Over 380 acres of salt marsh was restored and native riparian vegetation was planted along the streamsides. The project significantly reduced flooding of homes and farms in Ferndale, California, and now provides essential rearing habitat for threatened salmon and steelhead.
Removed the Benbow Dam, opening up 98 miles of spawning grounds. In 2016, NOAA and California State Parks removed the Benbow Dam, improving access to over 98 miles of high-quality habitat. California’s second largest dam removal improved public safety and liability for the state.
Improved spawning and rearing habitat in the Eel River headwaters. In several major tributaries, sediment sources have been addressed by decommissioning dirt roads that are no longer needed. In-stream habitat has been improved by strategically placing large wood in the channel to improve pool habitat, cover, and gravel sorting.
As a result of these efforts, NOAA has documented increased numbers of juvenile salmon and steelhead trout using the estuary, which improves their survival in the ocean. That helps insure that they grow up and come back to their spawning habitat. Access to more spawning habitat and more sheltered, shaded streamsides in the higher tributaries means more spawning and rearing habitat. NOAA will continue to focus on additional high-priority actions to improve habitat in the Eel River, and support a healthy population of wild fish.
Case Study: Santee River Basin Watershed Planning
The Santee River Basin, in North and South Carolina, currently supports some of the largest populations of migratory fishes on the east coast of the United States, yet population levels remain depleted compared to historical levels. Several fish species in the southeastern U.S. including endangered sturgeon, eels, and river herring, face threats including barriers to migration, poor water quality, habitat loss, and competition from invasive species.
The NOAA Hydropower Program works with partners including other federal agencies, industry, states, non-governmental organizations, and Tribes to identify and implement solutions to reopen rivers to migratory fish while preserving hydropower generation. Through these actions, NOAA aids in the recovery of threatened and endangered species and contributes to the sustainability of economically important commercial and recreational fisheries by making previously blocked upstream habitat accessible allowing fish to breed and complete their life cycles.
To address the threats facing fish species in the Santee River Basin, NOAA worked with the U.S. Fish and Wildlife Service and resource agencies in the states of North Carolina and South Carolina to develop the Santee Basin Restoration Plan.
This plan takes a unique approach toward restoring migratory fish by planning for the entire watershed rather than addressing one project at a time. A basin or watershed plan offers an opportunity for management agencies to coordinate restoration activities, balance competing needs in the watershed, and maximize funding for mutual restoration priorities. The Santee Basin Plan provides several objectives to improve fish habitats including: improving water quality, increasing river flows, providing fish passage, and enhancing monitoring.