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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | Hangman Creek Watershed Nutrients and Sediment Pollutant Source Assessment |
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Hangman Creek Watershed Nutrients and Sediment Pollutant Source Assessment (Number of pages: 223) (Publication Size: 12253KB)
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| Author(s) | Stuart, T. | ||||
| Description | Hangman Creek, a major tributary to the Spokane River, experiences water quality problems including high sediment and phosphorus conditions. This creek is an important contributor of sediment and phosphorus to the Spokane River. The Washington State Department of Ecology (Ecology) has developed Total Maximum Daily Load (TMDL) water cleanup plans that regulate the amount of sediment and phosphorus in Hangman Creek. Ecology performed a pollutant source assessment to (1) evaluate current conditions in Hangman Creek with respect to these TMDL requirements, (2) assess long-term trends, and (3) quantify the actions needed throughout the watershed to meet TMDL goals. During 2018, Ecology collected data for Hangman Creek and its tributaries. We found that the vast majority (~100%) of springtime sediment and phosphorus loading originates in the upper (southeastern) ~2/3 of the Hangman Creek watershed. However, per-square-mile loading varies greatly by subbasin within this area. The majority of summertime total phosphorus (~60%) and dissolved inorganic nitrogen (~95%) loading reaching the mouth of Hangman Creek originates in the lower watershed and is associated with groundwater. Sediment conditions in Hangman Creek have improved substantially over the last four decades, but remain extremely high during the springtime high-flow season. Meeting the load allocation for total phosphorus established by the Spokane River and Lake Spokane Dissolved Oxygen TMDL will require eliminating the vast majority of springtime sediment (95%) and phosphorus (76%) loading in Hangman Creek. Although daunting, this is likely an achievable goal that would profoundly improve water quality in Hangman Creek and its tributaries. |
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The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.
ADA Accessibility The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188. Visit Ecology’s website for more information. |
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| Contact | Tighe Stuart at 360-407-6764 or tist461@ecy.wa.gov | ||||
| Keywords | source assessment, Hangman Creek, pollutant loading assessment, pH, nutrient, dissolved oxygen | ||||
| WATERSHED | Water Resource Inventory Area 56 Hangman | ||||
| DATA | Environmental Information Management (EIM) #tist0002 |
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| RELATED PUBLICATIONS | Title:
Tekoa Wastewater Treatment Plant Dissolved Oxygen, pH, and Nutrients Receiving Water Study Quality Assurance Project Plan: Hangman Creek Dissolved Oxygen, pH, and Nutrients Pollutant Source Assessment Addendum to Quality Assurance Project Plan: Hangman Creek Watershed Dissolved Oxygen and pH Total Maximum Daily Load Quality Assurance Project Plan: Hangman Creek Watershed Dissolved Oxygen and pH Total Maximum Daily Load Water Quality Study Design |
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