In this presentation, the authors will present the recent work on a community operational physical-biogeochemical modeling system for the Chesapeake Bay (ChesROMS) with focus on skill assessment using a new metric. Model results of years 2007 to 2009 will be analyzed and salinity stratification will be the main target assessment quantity. The new skill metric is based on average discrete Frechet Distance between observed values and modeled values. A new skill score based on this metric will be proposed and compared to traditional RMSE based skills such as the Wilmott Skill (1981), the Murphy Skill (1988) and the Jolliff Skill (2009). Discussions on future application of ChesROMS and the new skill assessment method will be also be provided.