Three Creeks Dam

Three Creeks Dam is a 91-foot high, zoned earth fill dam designed and constructed by the Utah Division of Water Resources in the late 1940’s. Since its first filling numerous downstream seepage collection features were needed. In addition to embankment seepage, Phase II studies identified high uplift pore pressures in the downstream foundation along with liquefiable foundation materials suggesting stability risks under near full operation and earthquake loading. We provided geotechnical design services associated with rehabilitation including:

  • Field and Laboratory Studies
  • Seismic Hazard Assessments – a detailed deterministic study along with earthquake response analyses was performed to develop a design site response spectra and peak ground accelerations.
  • Geotechnical Analysis – static, seismic, and rapid drawdown stability analyses; liquefaction analyses, filter/drain design and piping analyses, fuse plug design
  • Design and construction of:
    1. a) foundation relief wells and toe drain collection system to reduce uplift pore pressures;
    2. b) downstream stability berm to increase embankment stability during a seismic event;
    3. c) downstream drainage blankets capture embankment seepage and reduce piping risks;
    4. d) fuse-plug spillway and soil-nail-wall to spillway to address critical flood scenario.