The Freshwater Trust is a medium-sized non-profit based in Portland that is engaged in river habitat, flow, and riparian restoration around the state. They are also involved in policy and legal work around getting a more complete framework in place to allow ecological solutions instead of engineered solutions to river degradation.
There are currently two full-time, permanent openings for a Habitat Restoration Coordinator/ Project Manager, and for a Monitoring and Field Data Manager. See http://www.thefreshwatertrust.org/about-us/careers/for details.
Both jobs have a GIS or GPS requirement for skills and qualifications.