September 25 , 2017 | 9:56 am PST
Current reservoir level

Project Overview

What has happened so far?

In 1999, the Colville Confederated Tribes petitioned the EPA to conduct an assessment of environmental contamination in the Upper Columbia River. This request was due to questions over possible risks to human health and the environment as a result of past industrial and municipal activities. These activities included mining, milling, smelting operations, and other industrial operations like pulp and paper facilities. Influences on the Upper Columbia River from municipal waste, agriculture, recreation and tributaries such as the Spokane River have also been identified.

Results of a 2001 preliminary EPA study showed that contamination was present in sediment above the Grand Coulee Dam. A detailed investigation was needed to evaluate possible risks to human health and the environment. The EPA began conducting expanded studies in 2004, and in 2006 Teck American agreed to complete and fund the work with oversight from the EPA.

Who is Teck American and why are they involved?

What is the purpose of these expanded studies?

Where is the Upper Columbia River Study site?

What has yet to be done?