Freese and Nichols evaluated Van Buren Dam to comply with the Texas Commission on Environmental Quality’s revised Dam Safety Rules and designed improvements using natural materials and roller-compacted concrete (RCC) to weather the area’s arid climate. The design also is based on meeting 75 percent of the Probable Maximum Flood, a cost-saving measure allowed by TCEQ’s new rules. The design included the balance of 77,000 cubic yards of excavation to allow for additional flood storage, a RCC emergency spillway in the center of the embankment, and a three-foot high reinforced concrete parapet wall along the length of the 1,000-foot long embankment. Freese and Nichols updated the existing computer model (HEC-HMS) for the Probable Maximum Flood (PMF) for the Van Buren Dam. Freese and Nichols also developed a new computer model, HEC-RAS, for the channel downstream from the dam to the Jefferson Street inlet. Freese and Nichols provided evaluation, design phase and bid phase services for the Van Buren Dam Improvement, as well as construction phase representation.