The Willamette Ecosystem Services Project seeks to quantify ecosystem services and understand the effects of anthropogenic stresses on those services in order to provide a rigorous scientific basis for valuing ecological benefits of existing and proposed policies. The project objectives are: (1) Provide a model-based approach that predicts responses of ecosystem services to probable future conditions; (2) Identify critical knowledge gaps in the ecological processes underlying ecosystem services; (3) Quantify ecosystem services, including their distribution, status, and responses to current and projected future conditions; and (4) Evaluate net benefits of bundled ecosystem services and tradeoffs among management actions that affect these services.