Quantum Consulting Engineers provided structural engineering design services for the construction of a scale model of Seattle City Lights Boundary Dam located in Northeastern Washington. The scale model was constructed to simulate the arched profile of the dam as well as it’s spillway ramps and downstream topography. The model along with various combinations of water flow and gate settings will be used to assist in predicting the up and down stream effects of future gate and flow modifications resulting from the ongoing use of the dam.