River and MountainFog on the watersmall whitewaterElk and waterLighting shot

Welcome to Amnis Opes Institute

The Amnis Opes Institute (AOI) delivers efficient and high quality environmental services to meet clients needs.

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Recent Publications

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Watershed Assessments Move Forward

AOI continues its work on behalf of the U.S. EPA and the Washington Department of Ecology to implement rigorous stream assessments.

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