Tualatin Basin Information

The Tualatin River watershed in northwest Oregon drains 712 square miles and ranges from the densely populated areas of southwest Portland, Hillsboro, Tigard and Beaverton to agricultural areas near Scholls, Gaston, Banks, Mountaindale and North Plains to the forests of Oregon’s Coast Range, Tualatin Mountains and Chehalem Mountains. Most of the fast-growing urban population -- approximately 500,000 residents -- resides on 15% of the watershed’s area. Agricultural uses take up 35% and 50% of the watershed is forest.

Tualatin River Watershed Action Plan

Tualatin River Watershed Technical Supplement

Watershed Analyses

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

Lower Gales Creek Enhancement Planning
Geomorphic Assessment • Technical Study

Lower Gales Creek Habitat Enhancement Plan

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

Gales Creek Large Woody Debris Inventory Report

Macroinvertebrate and Fish Studies

Links to Publications

USGS Publications on the Tualatin Basin:   
     or.water.usgs.gov/tualatin/

Tualatin Basin Flow Reports:
     www.co.washington.or.us/deptmts/wtr_mstr/flow_reports.htm

Flow and Water Quality data:

Oregon Water Resources Department -

http://www.goeslink.com/

U.S. Geological Survey:
http://or.water.usgs.gov/tulatin

Jackson Bottom Wetlands Preserve:
http://www.jacksonbottom.org/waterquality_graphs.hti?TR14

Information on the Tualatin Basin

The W.A.T.E.R. Project: Watershed Awareness through Electronic Resources: www.water.pacificu.edu