For questions about the King County  Streams Monitoring Program, please contact Debra Bouchard (206) 263-6343, or Sally Abella (206) 296-8382.

Streams and River Monitoring Reports

Stream reports are available to download and are provided in Adobe PDF format. You will need Adobe Acrobat to view the document. If you do not have this software, you can download a free copy of Adobe© Acrobat© Reader

  • 520 Bridge Storm Water Runoff Report

    • The Highway 520 Bridge Storm Water Runoff Study is a data collection effort that is part of the Sammamish-Washington Analysis and Modeling Program (SWAMP). SWAMP is a water quality and quantity monitoring and modeling project that was initiated in 2000 to support a variety of potential water resource decisions for the majority of the Greater Lake Washington watershed.

  • Assessing the Impact of Pesticide Mixtures on the Survival and Fecundity of Daphnia pulex Report

    • The Assessing the Impact of Pesticide Mixtures on the Survival and Fecundity of Daphnia pulex study was designed to assess the effects of mixtures on pesticides on stream organisms over several generations.

  • Benthic Macroinvertebrate Study of the Greater Lake Washington and Green-Duwamish River Watersheds Reports

    • This report summarizes benthic macroinvertebrate data collected from a total of 130 sites in 20 sub-basins in the Green Duwamish River and Greater Lake Washington watersheds during August and September 2003 and 2003.

  • Climate Change Impacts on River Flooding

    • This study looks into rainfall and river flow data throughout King County to determine whether large storm events and large flooding events are happening more often than they used to. This study also looks into results of computer modeling efforts at the University of Washington to understand whether such changes might happen in the future.

  • East Hylebos Creek 2001 Monitoring Program Final Report

    • The 2001 East Hylebos Creek Monitoring Program Final Report provides a general characterization of water quality, stream flow, and aquatic habitat conditions in the lower reaches of the East Hylebos Creek system.

  • Endocrine Disruptors in King County Surface Waters

    • Survey of endocrine disupting compounds in King County surface waters including streams, lakes, and marine waters.

  • Existing Water Quality Conditions in the Snoqualmie River Near the City of Carnation

    • Baseline water quality monitoring results from 2003-2004 in the Snoqualmie and Tolt Rivers near the City of Carnation, King County, Washington State.

  • Fish Index of Biotic Integrity

    • The development of a fish index of biotic integrity (FIBI) for the greater Lake Washington watershed was undertaken as part of the weight-of-evidence component of an ecological risk assessment for the Sammamish-Washington Analysis and Monitoring Program (SWAMP).

  • Freshwater Stream Sediment Review of Historical Monitoring Data 1987-2002

    • This data report describes the streams sediment monitoring program and provides a review of the historical freshwater stream sediment quality data for the period 1987–2002.

  • Green-Duwamish Microbial Source Tracking Report

    • This report describes the results of a microbial source tracking project on the Green River.

  • Green-Duwamish Temperature Report

    • This report provides an assessment of surface water temperature conditions as part of a larger assessment of the Green-Duwamish watershed.

  • Green-Duwamish Water Quality Statistical and Pollutant Loadings Analysis

    • Loading estimates for fecal coliform bacteria, E. coli, total phosphorus, orthophosphate phosphorus, nitrate+nitrite nitrogen, ammonia nitrogen, total suspended solids, and total and dissolved copper, mercury, zinc and iron, were developed for different land cover types in the Green River watershed.

  • Green-Duwamish Watershed Water Quality Assessment: Year 2003 Water Quality Data Report

    • In 2001, King County initiated a comprehensive study of the Green-Duwamish watershed, called the Green-Duwamish Watershed Water Quality Assessment (GDWQA) Comprehensive Monitoring Program. The primary purpose of this program was to collect and analyze water quality data within the Green-Duwamish watershed and to use these data to support a variety of King County water quality planning efforts. This document represents the second of two water quality data reports and evaluates data collected during the 2003 calendar year.

  • Habitat Inventory and Assessment of Three Sammamish River Tributaries

    • From August to November of 1999, King County conducted habitat assessments on Swamp, North, and Little Bear Creeks using methods derived from standard assessment protocols

  • Juanita Creek Inventory and Habitat Assessment

    • In August of 2000, habitat on Juanita Creek was assessed using methods derived from standard assessment protocols. The goals of the habitat assessment project for Juanita Creek were threefold: (1) characterize instream and riparian habitat quality– primarily for salmonids; (2) establish a baseline for future evaluation of trends in habitat quality and watershed function; and (3) provide information for process of prioritizing areas for restoration and preservation.

  • King County DNRP Performance Measures

    • King County is committed to creating a high performance organization that is accountable to the public we serve. As part of this commitment, the Department of Natural Resources and Parks is in its third year of measuring our performance and using this performance information to improve the environment and quality of life in King County.

  • King County Wetland-breeding Amphibian Monitoring Program: 1993-1997 Summary Report

    • This summary report describes the purpose, implementation and initial findings of King County’s Wetland-Breeding Amphibian Monitoring Program. From 1993 through 1997 the county worked with 126 trained volunteers to census amphibian eggs, juveniles and adults in 81 freshwater palustrine wetlands of 26 watersheds in King County.

  • Lake Washington Existing Conditions Report

    • The Water Quality Monitoring of Northern Lake Washington Streams Report summarizes 20 years of water quality data collected from stream sites, primarily in the northern Lake Washington basin.

  • Major Lakes Phytoplankton Sampling Techniques Comparison Study

    • The Major Lakes Phytoplankton Study was initiated in March 2003 and involved the collection of integrated composite samples of surface water for phytoplankton species identification, enumeration, and estimation of species-specific phytoplankton biovolume.

  • Mercer Island Streams Water Quality Report, 2003-2005

    • Report on the water quality of streams in 5 basins on Mercer Island, Washington

  • Mercer Island Streams Water Quality Report, 2006

    • Report on the water quality of streams in 5 basins on Mercer Island, Washington

  • Mill Creek and Mullen Slough DO report, 2006

    • King County funded the University of Washington Center for Water and Watershed Studies to monitor the duration and timing of dissolved oxygen (DO) levels in two streams within the floodplain of the lower Green River.

  • Newaukum Basin Characterization Project Report

    • Report on the present conditions, ecological alterations and knowledge gaps, and anticipated future changes in the Newaukum Creek basin.

  • North Lake Washington Streams Report

    • As part of its mission to protect and restore water quality, the Water and Lands Resources Division studied water quality trends and conditions in Lake Washington from 1990 to 2001.

  • Phosphorus Transport Study

    • The objective of this study was to develop time series models describing stream water phosphorus concentration dependence on seasonal variations in stream baseflow, short term flow fluctuations, antecedent flow conditions, and rainfall.

  • Pilot Freshwater Mussel Survey in King County

    • Results of a pilot freshwater mussel survey in Bear Creek, Stossel Creek, and Covington Creek, King County, Washington State.

  • Puget Sound Stream Benthos: Monitoring Status and Data Management


  • Riparian Shade Characterization Study

    • This report summarizes the results of the field work and analyses conducted as part of the Green-Duwamish Water Quality Assessment: Riparian Shade Characterization Sampling and Analysis Plan (King County 2004) and additional field work conducted on the Sammamish River. Analysis of recent high resolution Light Detection And Ranging (LiDAR) data are also evaluated in this report to assess their potential utility in conducting basin-scale riparian shade assessments.

  • Sammamish River Corridor Action Plan

    • The plan focuses on the Sammamish River's role as a necessary migratory corridor for anadromous salmon in the Sammamish Watershed. Implementation of the plan, however, would benefit more than just salmon and a wide range of other wildlife; it would also enhance the river corridor's ability to serve as a place of pleasure and refuge for the surrounding human community.

  • Sammamish River Diel pH and Dissolved Oxygen Study

    • The Sammamish River has recently been the focus of a number of water quality studies, primarily due to the use of the river by Endangered Species Act (ESA) listed species of salmon. A review of Sammamish River monitoring data has also led the Washington State Department of Ecology to identify water quality problems related to elevated levels of fecal coliform bacteria, temperature, and pH and reduced levels of dissolved oxygen in the river (Washington State Department of Ecology 2000 303(d) list of impaired waters).

  • Sammamish River Water and Sediment Quality Assessment

    • The objectives of the project were to provide an assessment of the current water and sediment quality conditions in the river, and to begin a database of analytical results for Sammamish River that would be useful for multiple King County projects (e.g., ESA-listed salmon, water reuse).

  • Sammamish River Water Quality Model

    • Report on the development of a laterally-average 2-dimensional water quality model (CE-QUAL-W2 V3.2) of the Sammamish River

  • Sediment Quality Evaluation in Lake Sammamish, Lake Union, and Lake Washingon The Sediment Quality Triad (SQT) approach to sediment quality evaluation was used to characterize and assess the extent of altered benthic invertebrate assemblages, sediment contamination and toxicity in Lakes Sammamish, Washington, and Union near Seattle, Washington.


  • Sediment Toxicity Report

    • The Sediment Quality Triad (SQT) approach to sediment quality evaluation was used to characterize and assess the extent of altered benthic invertebrate assemblages, sediment contamination and toxicity in Lakes Sammamish, Washington, and Union near Seattle, Washington.

  • Snoqualmie Watershed Aquatic Habitat Conditions Report, 1999-2001

    • This report summarizes and interprets data collected in the field from 1999-2001 about habitat conditions for multiple species of salmonids and other aquatic biota in aquatic ecosystems of the Snoqualmie Watershed, including the mainstem Snoqualmie River and several of its tributaries.

  • Snoqualmie Watershed Water Quality Synthesis Report January 2009

    • The report brings together available water quality information in each of the key tributaries and mainstem areas to help identify priorities for on-the-ground actions.

  • Snoqualmie Watershed Geology Report

    • An overview of the geology and geomorphology of the Snoqualmie River Watershed

    Snoqualmie Watershed Stream Habitat Reconnaissance Report
    Assessment of habitat conditions, presence and relative distribution of salmonid species and other aquatic biota in 14 rivers and streams in the lower Snoqualmie Watershed.

  • Streams Toxicity/Pesticide Report, 1999

    • The Small Streams Toxicity/Pesticide Study is a study intended to assess the possible biological implications associated with the presence of pesticides in selected small streams in King County.

  • Streams Toxicity/Pesticide Report, 2000

    • The Small Streams Toxicity/Pesticide Study is a study intended to assess the possible biological implications associated with the presence of pesticides in selected small streams in King County.

  • Water Quality Monitoring of Five Mercer Island Drainage Basins from 2008–2010

    • This report presents results from field and laboratory investigations conducted from 2008 through 2010 in five basins on Mercer Island.

Sampling and Analysis Plans
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