The Union Ditch Diversion Dam, constructed in the early 1900s, was no longer functional for checking the river and controlling diversions to the Union Ditch. The diversion dam is approximately ten feet in height and 200 feet in length and provides for diversion of up to 175 cfs. EA provided geotechnical investigations and design; conducted hydrologic and hydraulic analysis; and provided structural design for the replacement diversion dam. EA also provided construction drawings, specifications, and contract documents for the project and provided the contract administration and resident inspection and quality control testing during construction. The new diversion dam structure includes a 40 foot Obermeyer gate with automatic controls, and the diversion structure into the ditch contains two 10 foot Obermeyer gates that are also remotely controlled.