Environmental Reports

Over the years many reports have been written about the Tualatin River watershed.  This is a partial set.  It also has links to other sources of information and reports.

Tualatin River Rapid Bio-Assessments, 2013 & 2014

Bio-Surveys, LLC conducted snorkel surveys to determine the distribution and abundance of juvenile salmonids in 138.2 miles of Gales Creek, Upper Tualatin River, and the Dairy-McKay Creek watersheds in the summer of 2013 and in 91.8 miles of Gales, East Fork Diary, Rock McFee, Heaton, and Chicken crees in 2014.  The data collected is for informational purposes only and does not require the landowners to change any of their land management practices.  The information will help the Council prepare meaningful restoration plans when they seek grants to improve habitat on willing landowner’s property.

Tualatin River Watershed Action Plan, 1999

The Action Plan was developed by the Council to provide guidelines and recommendations for restoring and maintaining the Tualatin River Watershed through volunteer and government-sponsored efforts.  This approach allows individual landowners, businesses, and residents to take voluntary actions to improve watershed conditions.  By voluntarily working together to identify priorities and to coordinate their actions through the Action Plan, these groups can work together more efficiently and effectively to restore the watershed.

Tualatin River Watershed Technical Supplement, 1998

The Technical Supplement contains detailed information about the Tualatin River Watershed.  It was written to support the Tualatin River Watershed Action Plan, 1999.

The Tualatin River Watershed Atlas, 2001 

Do you want to know a bit about the history of the Tualatin Watershed?  What water quality issues are streams in the Tualatin Watershed facing?  What areas are thought to have fish?  There is even information on the geography of the area.  The Watershed Atlas and its maps easily document this information.

Subbasins entire

Watershed Analyses

The Action Plan Item #1 is to assess the watershed conditions to help prioritize restoration activities.  In support of this, the Council and its partners produced the following five reports.  The watershed analyses offer an integrated, whole-basin approach to watershed related activities.  There is also a summary for each report.

     Upper Tualatin – Scoggins Watershed Analysis, 2000

     Gales Creek Watershed Assessment Project, 1998

     Dairy – McKay Watershed Analysis, 1999

     Middle Tualatin – Rock Creek Watershed Analysis, 2001

     Lower Tualatin Watershed Analysis, 2001


Gales Creek Sub-Basin Restoration Action Plan, April 2015

The Gales Creek Sub-Basin has been identified by the Tualatin River Watershed Council as a high-priority area for Upper Willamette River (UWR) steelhead spawning and rearing as well as for other native fish and wildlife. Many Tualatin River Basin partners have been active in restoration projects throughout the Gales Creek Sub-Basin. This restoration work includes wetland, riparian, and upland enhancement; large wood placement; replacement of fish passage barrier culverts; and increased stream flow.

This Restoration Action Plan builds on past restoration accomplishments by providing a framework and systematic approach to restoration throughout the Gales Creek Sub-Basin. The Restoration Action Plan evaluates the factors limiting focal fish populations (winter steelhead, coho salmon, Pacific lamprey, and cutthroat trout) and water quality and identifies approaches and activities that will address watershed health issues over time.

Lower Gales Creek Reports

In 2002 the Council entered into a reimbursement contract with the Bureau of Reclamation to conduct the mitigation work for the Scoggins Dam project.  The Watershed Analyses previously completed indicated that lower Gales Creek should be a priority area for restoration.  The first efforts, under the contract, focused on obtaining more detailed information on the lower sections of Gales Creek.  This information was used to design and prioritize projects in this area.

Lower Gales Creek Habitat Enhancement Plan, 2003

Lower Gales Creek Enhancement Planning Geomorphic Assessment, Technical Study, 2006

Lower Gales Creek Enhancement Plan Knotweed and Ivy Mapping and Report August 2005 – February 2006

Gales Creek Large Woody Debris Inventory Report, 2006


Occupancy and Distribution of Larval Pacific Lamprey and Lampetra spp. in Wadeable Streams of the Pacific Northwest – FY 2015 Report

Macro-invertebrate and Fish Studies

This is a set of reports on studies done by a variety of organizations.

Clean Water Services DNA Fingerprinting of Bacteria Sources in the Tualatin Sub-basin, 2005

Links to Publications

USGS Publications on the Tualatin Basin

This site has over 25 reports on the Tualatin River Basin.  The data used in the reports goes back to 1991.  They cover both the main stem Tualatin River and the tributaries.  This information was used extensively in establishing the Total Maximum Daily Loads on the Tualatin Basin.  or.water.usgs.gov/tualatin/biblio.html

Tualatin Basin Flow Reports

Since it’s inception in 1987, the Tualatin River Flow Management Technical Committee has provided a mechanism for the coordination and management of flow in the Tualatin River.  The members of the committee are technical staff with detailed knowledge of the specific characteristics of flow in this river.  The committee meets monthly and reviews hydrographs and current status of the reservoirs. Each member updates the committee on any changes that could impact the flow management of the Tualatin Basin. These reports are a compilation of hydrographic and water quality data collected by the cooperating entities and prepared by Clean Water Services.  http://www.co.washington.or.us/Watermaster/SurfaceWater/tualatin-river-flow-technical-committee-annual-report.cfm

Flow and Water Quality Data

Oregon Water Resources Department

The Oregon Water Resources Department, District 18 measures flow at 10 sites on the Tualatin River and its tributaries.  This hourly data is posted on the web on a nearly real time basis.  http://apps.wrd.state.or.us/apps/sw/hydro_near_real_time/Default.aspx

The first time you go to the Oregon Water Resources Department flow site on a given computer, it is helpful to set it up so it goes directly to the Tualatin Basin flow stations.  This only has to be done once per computer.

      • Click on (Login)  under My Stations on the right side of the page
      • In the box for your email address type: OWRD_Hydro_predefined_district_18
      • Click on Return to Gage Search Menu
      • Now it will say (Manage) under My Stations on the right side of the page
      • Click the drop down menu for My Stations and click on District 18
      • Now only the Tualatin River flow stations will be listed (Both OWRD sites and USGS sites will be listed).

U.S. Geological Survey

The USGS has been collecting water quality and flow data on the Tualatin River and its tributaries since 1991.  This data is stored at hourly increments on a near real time basis.  http://or.water.usgs.gov/tualatin/monitors/monitors.html

U.S. Geology Survey Monitors

This is a quick link directly to the water quality monitors.  http://or.water.usgs.gov/tualatin/monitors/monitors_nomap.html

Jackson Bottom Wetlands Preserve

The Jackson Bottom Wetlands Preserve collects water quality and flow data on the Tualatin River near its location on HWY 219.  http://www.jacksonbottom.org/monitoring-restoration/water-quality-tualatin-river-data/