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Log-term simulation was performed using DRAINMOD v5.1 to study the impact of subsurface drainage on spring wheat yield in a Vallers soil at Brooks, northwest Minnesota. The result shows that drainage is effective in ensuring wheat harvest by reducing the days of waterlogging (excess water) and plant delay, the two main causes of yield reduction in northwest Minnesota. Without drainage, the average annual yield of wheat was only 65% of the potential yield, over the 100-yr simulation period. With subsurface drainage, the average annual yield increased to 78-82% of the potential yield. Drainage also increased the wheat resistance to drought and reduced drought yield reduction through enhancing the development of root systems in early growth stages. Concentrated precipitations that occurred during planting time caused plant delay and were primarily responsible for simulated yield losses.