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The Network of Oregon Watersheds provides a map of and links to watershed councils around the state.
A variety of non profits and non-governmental organizations can be helpful to research on water resources. Particularly in fields that deal with policy and management of water resources. They can also be a good source of data and reference material such as maps and statistics.
University and extension services resources are included here as well.
The Oregon Explorer provides many sources for information about natural resources in Oregon. This includes several place based geographically focused on basins (such as the Umpqua Basin, Deschutes Basin, and others). Oregon Explorer also includes a wetlands explorer highlight the history and science of wetlands in Oregon.
Provides a search interface for UNESCO documents on water. Many are available for free.
Google Custom Search Engine
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Try this custom search engine to search through selected organization and government websites. This search engine can be used to supplement other search strategies for government and organizational research, publications, and data.