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About the Water Quality Program

Since 1994, the Stillaguamish Tribe has been involved in monitoring the water quality in the Stillaguamish Watershed as part of their efforts to recover salmon. The Tribe has worked cooperatively with federal, state, and local governments in order to attain a coordinated process to spot potential water quality problems. However, problems continue to occur as more demands on surface and ground water increase. As a result, water quality is often degraded from point and non-point sources. The Stillaguamish Natural Resources Department has developed a monitoring project plan for the Stillaguamish Watershed in order to ascertain problem sites and shares its data with other agencies and parties involved.

The Stillaguamish Natural Resources Department maintains an accurate water quality database for selected sites on the North and South Forks and selected tributaries, the Mainstem and selected tributaries, and Port Susan. The Department collects a variety of water quality data. Currently, water quality samples are collected on a quarterly basis. Water quality data such as temperature, conductivity, dissolved oxygen, turbidity, total suspended solids, alkalinity, hardness, and fecal coliform are among the parameters the Stillaguamish Natural Resources Department collects and shares with other agencies.

About the Stillaguamish Watershed Drainage

The Stillaguamish Watershed drains 694 square miles of Snohomish and Skagit Counties. The Stillaguamish River is mainly comprised of the North and South Forks, which flow westerly from the foothills of the Cascades. The headwaters of the North and South Forks are Class AA waters. The North Fork changes to Class A at the confluence with Squire Creek, and the South Fork changes to Class A at the confluence with Canyon Creek. The upper watershed is characterized by low-density rural residential, small farms, and timber-harvesting land uses. The Mainstem of the Stillaguamish (Class A) flows along a broad floodplain where the major land use is commercial farming. Most of the flow exits out of Hatt Slough into Port Susan. Some flow exits out through the old channel and flows through the town of Stanwood where it either empties into Port Susan or South Skagit Bay.

 Water Quality Data Summery 1993 - 2002


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