The Standley Lake Dam Improvement Project included the complete replacement of the outlet works, a new spillway with roller compacted concrete drop structures, enlargement of the toe berm, valve house construction, and the abandonment of the existing outlet works.
Lowering 104 Inch Steel Pipe into trench.
The pipeline portion of the Standley Lake Rehabilitation was comprised of two 72-inch diameter intake pipes, 104-inch diameter outlet pipe, 84-inch diameter outlet pipe, and miscellaneous yard and discharge pipes. The intake pipes were installed by microtunneling. The 84-inch outlet pipe and most of the 104-inch pipe was installed by standard cut and cover methods. Upon tunnel completion, 962 feet of 104-inch diameter pipe were placed in the tunnel and the annular space was filled with cellular concrete grout. All pipes were steel with an internal field applied mortar lining.
Deere & Ault’s staff provided construction engineering for the pipe installation and all underground work.
Clients: FRICO, Cities of Westminster, Northglenn, and Thornton