Dams
  Goldsborough Creek | Upper and Lower Baker Dams | Hawaii Dam Break Analysis | Piedra Liza Dam

The Goldsborough Creek Restoration Project was a joint effort between the USACE - Seattle District, Washington Department of Fish and Wildlife, and Simpson Timber Company. The project involved removal of an obsolete 35-foot-high dam and construction of 36 concrete weir structures that were designed to provide upstream and downstream passage for juvenile and adult salmonids. Each weir was given a compound horizontal and vertical alignment to direct flow toward the center of the stream, and a low-flow notch to assure passage for a range of discharges.

While fish passage was the primary intent of the project, stream restoration features included bioengineered bank protection, revegetation, large woody debris, boulders, and a stream substrate for fish spawning. Tetra Tech provided the necessary engineering, design, and construction support services from the post feasibility phase through project implementation. Tasks included cross-section survey, refined topographic mapping, detailed hydraulic, sediment, and scour analyses; wetland impact analyses; structural and civil design, geotechnical evaluation, planting plans, value engineering analyses, construction plans, specifications, cost estimates, and the operations and maintenance manual.

Tetra Tech also provided engineering support during construction that included reviewing contractor submittals for stream diversion and design of debris traps for an existing railroad trestle.

This project has been recognized by the Society of American Military Engineers with a Design Excellence Award for the team’s excellence in design, and partnership with a federal agency and private partner, and other local stakeholder groups.