Ash Creek Dam Outlet

This project was in New Harmony, UT near the Ash Creek Reservoir just off the north bound I-15. This was an annular fill project using 45 PCF lightweight cellular concrete (LCC). There was an arched tunnel in the native stone reaching over 230 linear feet into the mountain where it met with the previously completed section. A 42” pipe was installed by the general contractor, and we were asked to fill the void between the tunnel and the pipe.

Coordinating a plan with the general contractor, dam safety, engineer, and the water district, we proposed using a series of grout lines and vents through a concrete bulkhead to fill the voids. Filling the pipe with water and the bulkhead helped prevent buoyancy. This plan was a success and saved the general contractor over a week on their schedule.