The Milwaukee Green Infrastructure Scenarios Tool (GIST) helps decision makers to analyze various scenarios and determine the best stormwater management solutions in Milwaukee’s Kinnickinnic River Watershed. The tool recommends the green infrastructure project (i.e., green roofs, bioretention, stormwater trees, porous pavement, etc.) that best provides stormwater management, extreme weather resilience, job generation, aesthetics, and financial savings. The tool provides outputs of system performance measures (i.e., number of overflow events annually), capital and operational costs, and the co-benefits of the project, including improved water quality, energy savings, and increased jobs and property values.