Technical Data
Many stakeholders in the Clackamas River Watershed monitor water quality to meet regulatory requirements and to better understand the health of the watershed. Below are links to reports, studies, and technical data for the basin.
NEW – CRWP Climate Threat Characterization and Risk Assessment (2026)
In 2026, the Clackamas River Water Providers (CRWP) completed a climate-driven threat characterization and risk assessment for the five water treatment plants (WTPs) on the Clackamas River. The assessment was conducted to support a coordinated approach to climate risk management and resilience planning across the watershed using the American Water Works Association (AWWA) J100-21 risk assessment methodology.
The study evaluated how projected climate change impacts—including wildfires, drought, intense rainfall, and increased nutrient loading—could affect drinking water treatment. It examined risks such as degraded water quality from taste and odor compounds, cyanobacterial toxins, disinfection byproducts (DBPs), and increased potential for opportunistic pathogens such as Legionella. The assessment also considered impacts on critical treatment plant dependencies, including staffing, chemical supplies, and electrical power.
As part of Phase II, the project identified and evaluated risk reduction opportunities for the highest-priority risks at each facility. Near-term regional recommendations included implementing cyanotoxin prediction systems, expanding cyanotoxin monitoring, and conducting multi-facility cyanobacterial response exercises. These measures were identified as opportunities to reduce risk without requiring major capital investments.
For a copy of the Climate Threat Characterization and Risk Assessment report, contact Kim Swan at [email protected].
NEW – Water Quality Dashboard
https://crwproviders.maps.arcgis.com/apps/dashboards/a03a0d8a07834a77bb187cf8d80b63db
CRBC Results – 2024 Upper Clackamas eDNA Study
USGS – Reservoir and Riverine Sources of Cyanotoxin in Oregon 2025 Paper
CRWP Pollutant Load Modeling Tool (PLMT)
The purpose of the Clackamas River Watershed Pollutant Modeling Tool is to provide an interactive framework for estimating the relative impacts of land use and best management practices on drinking water source quality in various parts of the watershed. This tool can be used to assess baseline conditions and consider scenarios for land management and pollution reduction in accordance with the Clackamas River Watershed Drinking Water Protection and Source Water Assessment Plans. To access the tool go to https://crwp-pollutant-load-model.azurewebsites.net/
Clackamas River Watershed Agricultural Water Rights Project
The CRWP worked with a Graduate student at Portland State to understand how many agricultural water rights are in the Clackamas River watershed, where they are and how large they may be, and if there are opportunities to work with these landowners under Oregon water law to put water back instream to increase river flows. Check out the project Storymap here.
Clackamas River Basin Water Temperature Study
Year one data: Clackamas Water temp Study year 1 data logs master spreadsheet
Project website
Effects of climate change on stream temperature and salmonid habitats in a Cascades river basin – Journal of Environment Management
Scales of Connectivity within Stream Temperature Networks of the Clackamas River Basin, Oregon (2020-22) paper click here
CRWP Post Riverside Fire WQ monitoring
CRWP Post Fire Testing 2020-2022
Assess Wildfire Risk to Municipal Drinking Water
CRWP worked with the USFS Pacific NW Research Station to Assess Wildfire Risk to Municipal Drinking Water Sources. Click here to go to see a summary of the project. To see the results of this modeling work – see the Strategic Planning for Water, Infrastructure, and Aquatic Biota After Wildfire – Riverside Fire, Clackamas, Oregon storymap.
Water Quality
Clackamas River Basin Council
WATER QUALITY MONITORING REPORT – 2011
WATER QUALITY MONITORING REPORT – 2013
WATER QUALITY MONITORING REPORT – 2014
Oregon Department of Environmental Quality
AMBIENT WATER QUALITY MONITORING SYSTEM DATABASE
US Environmental Protection Agency
Water Quality Data
US Geological Survey
USGS Clackamas River Water Quality Monitoring Stations
Eagle Creek Water Quality
Eagle Creek water quality Bugni 2020 study final
Eagle Creek WQ Data Charts of results
Clackamas Soil and Water Conservation District
2011 CSWCD Water Quality Report
2010 CSWCD Water Quality Report
Microplastic Study (2021)
Talbot_CR_Pres – Microplastic Study
Microplastic_Report_CRWP
Environmental Pollution – Microplastics in freshwater: A global review of factors affecting spatial and temporal variations
Pesticides Studies and Reports
OR Department of Agriculture
GENERAL INFORMATION ON PESTICIDES AND WATER QUALITY
US Geological Survey
2005 REPORT ON PESTICIDES IN THE LOWER CLACKAMAS BASIN
Pesticide Stewardship Partnership (PSP)
Pesticide Stewardshiop Partnership webpage
PSP Biennium Report 2019-21
PSP Biennium Fact Sheet 2019-21
Pesticide Stewardship Partners Data Viewer https://rstudioconnect.deq.state.or.us/PSP-Data-Viewer/
Clackamas River Water Providers – Clackamas Soil & Water Conservation
Pesticide Reduction Video Series
Macroinvertebrates Studies and Reports
Clackamas River Water Providers
Lower Clackamas River Basin Macroinvertebrate Monitoring Plan
2023 LOWER CLACKAMAS RIVER MACROINVERTEBRATE ASSESSMENT
2022 Lower Clackamas Macroinvertebrate Assessment
2019 Lower Clackamas River Macroinvertebrate Assessment
2018 Lower Clackamas River Macrionvertebrare Assessmet
MACROINVERTEBRATE COMMUNITY CONDITIONS of the LOWER CLACKAMAS RIVER BASIN 1997-2016
Lower Clackamas River Macroinvertebrate Assessment (December 2013)
Lower Clackamas River Macroinvertebrate Assessment (2014)
2013-2015 Lower Clackamas River Macroinvertebrate Assessment
Clackamas Soil and Water Conservation District
2018 CSWCD Stream Benthic Macros Assessment
Macroinvertebrate Assessment 2018 Final Report Executive Summary
2016-CSWCD Stream Benthic Macro Assessment
2012 CSWCD Stream Benthic Macro Assessment
2012 CSWCD Aquatic Resources Study
Clackamas Water Enviormental Services
Clackamas WES Monitoring Report 2015
Clackamas River Basin Council
2013 CRBC macro data
2011 CRBC Macro data
Groundwater Information
- CRWP 2020 Groundwater Baseflow Study – CRWP Memo 2020 and Presentation.
- Ground Water and Climate
- Clackamas_Geomorphology_DrGrantOSU
- Groundwater in northern Clackamas County
Summary Reports
NRCS – National Water Quality Initiative Clackamas Source Water Assessment Plan (September 2022)
Final_CRWP_Source Water Assessment Plan Sept 2022
Source Water Assessment Plan Summary Presentation. NWQI- CTWG presentation Sept 2022
OR Department of Environmental Quality
CLACKAMAS SUBBASIN WATER QUALITY OVERVIEW
OR Department of Environmental Quality
OREGON’S 2022 INTEGRATED REPORT
US Geological Survey
STUDY OF ORGANIC COMPOUNDS IN CLACKAMAS RIVER WATER
DEQ Source Water Assessment
Clackamas River Public Water Systems
Annual Drinking Water Quality Reports
City of Estacada WATER QUALITY REPORTS
City of Gladstone CONSUMER CONFIDENCE REPORTS
City of Lake Oswego WATER QUALITY REPORTS
City of Oregon City WATER QUALITY REPORTS
City of West Linn WATER QUALITY REPORTS
Clackamas River Water WATER QUALITY REPORTS
Oak Lodge Water District WATER QUALITY REPORTS
Sunrise Water Authority WATER QUALITY REPORTS
Action Plans
Clackamas Partnership Strategic Restoration Action Plan 2018
Clackamas River Basin Council
BASIN ACTION PLAN
Clackamas River Water Providers
DRINKING WATER PROTECTION PLAN
OR Department of Agriculture
AGRICULTURAL WATER QUALITY MANAGEMENT PLANS
OR Department of Fish and Wildlife
UPPER WILLAMETTE RIVER CONSERVATION AND RECOVERY PLAN
Water Environment Services
WATERSHED HEALTH ACTION PLANS
Our Source
Drinking-Water Protection
Watershed Programs
Water Quality