Meghan Hodges
The Willamette River, the nation's 13th largest river in terms of flow, has historically been polluted by sewage and stormwater runoff, as well as toxic waste dumping, agricultural runoff, and trash pollution. In recent years, efforts have been made to improve water quality, and it is now considered safe for swimming and recreation in most instances. However, there are still occasional sewer overflow incidents, and trash pollution remains an issue, with sections of the river listed as impaired due to aquatic trash. The river also faces habitat degradation due to development and a lack of shallow areas for young salmon. While water quality has improved, there are still ongoing challenges to ensuring the health and sustainability of the Willamette River ecosystem.
| Characteristics | Values |
|---|---|
| Water quality | Safe for recreation except in rare instances of combined sewer overflow (CSO) |
| Bacteria levels | Almost always at healthy levels |
| E. coli bacteria | Dropped since the completion of the Big Pipe project in 2011 |
| Mercury levels | High enough for the Oregon Health Authority to issue consumption advisories |
| Trash pollution | Mounting, possibly due to increases in homelessness |
| Habitat | Low scores due to lack of shallow areas for young salmon and loss of off-channel habitat |
| Tree canopy | Low scores due to lack of trees in Central City and industrial areas |
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What You'll Learn
The Willamette River has a history of sewer overflows
The Willamette River has a long history of sewer overflows, which have contributed to its poor water quality. The river, which is the nation's 13th largest in terms of flow, became increasingly contaminated as Portland grew, and by the 1920s, it was severely polluted. One of the main sources of pollution was the city's combined sewer and stormwater system, which channelled residential sewage and rainwater runoff through the same pipes, dumping it straight into the river.
Portland's rainy climate also contributed to the problem, with frequent sewage overflows occurring when the combined volume of sewage and stormwater exceeded the capacity of the pipes. In the past, the city averaged 52 sewage overflow incidents per year, lasting several days at a time. This led to a perception among residents that the river was not safe for swimming or recreation, despite efforts to improve water quality.
In 1991, Portland began to address the issue with the Big Pipe project, a $1.4 billion, 20-year undertaking involving the construction of two massive underground pipes along the river to provide excess capacity during storms. The project was completed in 2011 and successfully eliminated almost all combined sewer overflows to the Willamette River, leading to a significant reduction in E. coli bacteria levels.
However, despite these improvements, the river continues to face pollution challenges. In recent years, there have been concerns about trash pollution, which has been linked to increases in homelessness. Additionally, the river has been impacted by agricultural runoff, urban development, and habitat loss, affecting the health of the watershed and the native fish and wildlife species that depend on it.
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E. coli bacteria levels are a health concern
E. coli bacteria levels are a primary health concern for those swimming or engaging in other direct-contact recreational activities in the Willamette River. While the river's water quality has improved significantly in recent years, with sewage overflow incidents becoming less frequent, E. coli bacteria remain a key indicator of fecal matter in the water.
The presence of E. coli bacteria in the Willamette River is largely attributed to combined sewer overflows (CSOs). In the past, Portland's combined sewer and stormwater system directed residential sewage and rainwater runoff through the same pipes, often dumping the untreated waste directly into the river. This resulted in frequent sewage contamination, especially in a city like Portland, which experiences high rainfall.
To address this issue, Portland embarked on the Big Pipe Project, a $1.4 billion, 20-year undertaking that involved constructing two massive underground pipes along the river. This project, completed in 2011, successfully eliminated almost all CSOs to the Willamette River, leading to a significant reduction in sewage discharge and a subsequent decrease in E. coli bacteria levels.
Despite the improvements, the river is still susceptible to occasional sewer overflow incidents, and E. coli bacteria remain a concern. The Oregon Department of Environmental Quality (DEQ) regularly monitors bacteria levels in the river and has stated that when CSOs are not present, the river is safe for swimming and recreation. However, the presence of E. coli bacteria from other sources, such as wildlife and pet waste, can still pose a health risk.
To ensure the safety of those using the river for recreation, Environmental Services conduct weekly testing for E. coli bacteria at eight locations along the Willamette River during the summer months. These tests help identify any potential health hazards, and the results are made publicly available to inform the community about the river's water quality.
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Mercury levels are high enough to require consumption advisories
The Willamette River has historically been a dumping ground for the city of Portland's combined sewer and stormwater system. While the city has taken steps to improve the water quality, it still struggles with sewage overflow incidents.
One of the key issues affecting the Willamette River is mercury pollution. In 2008, the Oregon Department of Environmental Quality (DEQ) developed a clean-up plan for the Willamette River basin to address this issue. Despite the plan's shortcomings, it was approved by the Environmental Protection Agency (EPA). However, in 2012, the NWEA challenged the adequacy of the mercury clean-up plan, and in 2017, a federal court ordered the EPA and DEQ to prepare a new mercury clean-up plan for the Willamette River basin.
Mercury is a toxic pollutant that can have harmful effects on both human and ecological health. The high levels of mercury in the Willamette River have led the Oregon Health Authority to issue consumption advisories. This means that people are advised to avoid eating fish from the river, as mercury can accumulate in the tissues of fish and pose a risk to human health.
The sources of mercury pollution in the Willamette River are varied and complex. One significant source is atmospheric deposition, where mercury emitted into the atmosphere from industrial processes and other sources can be deposited into the river through rainfall and other precipitation. Another source is historical mining activities, where mercury was used in the extraction of gold and other metals, and the leftover mercury-containing waste can make its way into the river system.
The efforts to reduce mercury pollution in the Willamette River are ongoing, and it is important to ensure that the river's ecosystem and the health of those who rely on it are protected. The new clean-up plan ordered by the federal court will hopefully address the shortcomings of the previous plan and lead to a more comprehensive approach to reducing mercury pollution in the river.
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Trash pollution is a problem, potentially linked to homelessness
The Willamette River has a long history of pollution, with the river becoming severely polluted by the 1920s. One of the main sources of pollution was the city's combined sewer and stormwater system, which channelled residential sewage and rainwater through the same pipes, dumping it into the river. Over the years, the city has made efforts to improve the water quality, and it is now considered safe for swimming and recreation. However, trash pollution remains a problem, and it has been linked to increases in homelessness.
For decades, the Willamette River in Portland, Oregon, was contaminated with sewage and other pollutants. In the early 20th century, the city's sewer system funnelled sewage and stormwater into the river, leading to high levels of contamination. Despite efforts to improve the situation, the river continued to face pollution issues due to sewer overflows and stormwater runoff.
In recent years, Portland has made significant progress in improving the water quality of the Willamette River. The city invested $1.4 billion in the Big Pipe project, which involved constructing two massive underground pipes along the river to manage excess stormwater and sewage. This project, completed in 2011, successfully eliminated almost all combined sewer overflows (CSOs) and reduced sewage contamination in the river. As a result, the levels of E. coli bacteria, an indicator of fecal matter, have significantly decreased, making the river safer for human recreation.
However, despite these improvements, trash pollution remains a persistent issue in the Willamette River. The Oregon Department of Environmental Quality (DEQ) has recognised the problem, proposing to list sections of the river as "impaired" due to aquatic trash. Trash pollution is not easily mitigated, as it does not have a single-point source that can be addressed. Instead, it is often linked to complex social issues, such as poverty and homelessness.
The nonprofit organisation Willamette Riverkeeper has reported that the increasing trash pollution in the river appears to be associated with rising homelessness. While they do not blame the homeless for this trash crisis, they advocate for increased resources from local and state governments, including improved access to housing and the provision of dumpsters. Volunteers with Willamette Riverkeeper have been actively involved in trash cleanups along the river since 2018, collecting and submitting data to the DEQ for their biennial report on surface water pollution.
In conclusion, while the Willamette River has witnessed significant improvements in water quality, particularly regarding sewage contamination, trash pollution remains a pressing concern. The issue of trash pollution is complex and potentially linked to homelessness and other social factors. Addressing this problem requires a multifaceted approach involving government intervention, increased resources, and collaborative efforts to clean and protect the river.
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Algae blooms can be hazardous
The Willamette River in Portland, Oregon, has historically been polluted by sewage and stormwater runoff, with the city averaging 52 sewage overflow incidents per year. However, in recent years, the water quality has improved significantly, and it is now considered safe for swimming and recreation. The city continues to issue warnings in rare cases when the water quality is not safe.
One potential hazard that remains is algae blooms, which can form in slow-moving parts of rivers and lakes during hot weather. Algae blooms can be hazardous, and the public is advised to stay out of the water if they observe water that looks green or has a coating on the surface. Algae blooms can produce toxins that are harmful to humans and animals. These toxins can cause skin irritation, allergic reactions, and, if ingested, can lead to more severe health issues, including gastrointestinal illness and neurological problems. In some cases, algae blooms can also deplete the oxygen in the water, leading to fish kills and creating dead zones in the river.
The Oregon Department of Environmental Quality (DEQ) is responsible for monitoring algae blooms in the Willamette River. They work to identify and address the sources of pollution that contribute to algae growth, such as agricultural runoff and warm water temperatures. DEQ has also been addressing trash pollution in the river, which has been linked to increases in homelessness in the area.
While the river is generally safe, it is important to be aware of the potential risks associated with algae blooms. The public is advised to check for current health advisories and avoid swimming or recreating in areas where algae blooms are present. Additionally, it is important to follow guidelines to prevent the spread of pollution and protect the health of the river and those who enjoy it.
The Willamette River has faced significant pollution challenges, but through investments in infrastructure and ongoing monitoring and cleanup efforts, the water quality has improved. By remaining vigilant and addressing issues like algae blooms and trash pollution, the river can continue to be a safe and enjoyable recreational resource for the community.
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Frequently asked questions
The Willamette River has historically been very polluted, but its water quality has improved dramatically in recent years. It is now safe for recreation, except in the rare instances when Combined Sewer Overflow (CSO) conditions are present.
One of the biggest pollution sources was the city's combined sewer and stormwater system, which funnels residential sewage and rainwater runoff through the same pipes, dumping it straight into the river. The city of Portland has tackled this problem with the Big Pipe Project, which has helped reduce sewage overflow incidents.
Other sources of pollution include toxic waste dumping, agricultural runoff, and trash, which has been linked to increases in homelessness. The river also scores low for habitat due to the loss of off-channel habitat and the impacts of urban development.
The Willamette River is generally safe for swimming and recreation. The city issues warnings in the rare cases when it is not safe. It is advised to avoid swimming in slow-moving parts of the river during hot weather, as algae blooms can form and pose a health risk.
The city of Portland has invested in infrastructure projects like the Big Pipe Project to reduce sewage overflow. The Oregon Department of Environmental Quality (DEQ) is also involved in monitoring and improving water quality, and nonprofit organizations like Willamette Riverkeeper work to protect the river and remove trash.
