Lower Tualatin Watershed Analysis

These watershed analyses are detailed studies of all aspects of each watershed's condition. For your convenience, we are also providing a summary of the information below.

Summary of Lower Tualatin Watershed Analysis (PDF File)

Full-text Watershed Analysis

These documents have been split into sections to facilitate downloading. Each section is a PDF file. Your browser should be able to open these documents automatically. If not, a free PDF reader is available here. File sizes are indicated in parentheses.

Lower Tualatin Report (1.5 MB)

Map 1-1 Location of the Lower Tualatin Watershed (1.3 MB)

Map 1-2 Lower Tualatin Watershed and Subwatersheds
(270 KB)

Map 1-3 Terrain elevation of the Lower Tualatin Watershed (1.3 MB)

Map 1-4 Geology of the Lower Tualatin Watershed (212 KB)

Map 1-5 Population Density (1990) of the Lower Tualatin Watershed (344 KB)

Map 1-6 Parks and Open Spaces in the Lower Tualatin Watershed (288 KB)

Map 3-1 Slope Classes of the Lower Tualatin Watershed (256 KB)

Map 3-2 Floodplains and Wetlands of the Lower Tualatin Watershed (388 KB)

Map 3-3 Stream Channel Types in the Lower Tualatin Watershed (366 KB)

Map 3-4 Water Quality and Water Supply for the Lower Tualatin Watershed (270 KB)

Map 3-5 Fish Distribution in the Lower Tualatin Watershed (252 KB)

Map 3-6 Land Use and Land Cover in the Lower Tualatin Watershed (316 KB)

Map 3-7 Road Density and Road/Stream Crossings in the Lower Tualatin Watershed (344 KB)

Appendix 1 ((232 KB)