This report presents a return on investment analysis of the North Wind’s Weir Restoration project. The environmental benefits provided by the restored transition zone of the lower Duwamish River are considered over time. The restoration, although a small area, will provide long-term benefits, particularly for salmon habitat. The results justified investment in the North Wind's Weir restoration project, and the report outcomes have been featured in numerous presentations to federal partners, namely HUD and FEMA, in support of natural capital investment.