Highridge Water Authority Tubmill Dam

Tubmill Dam is an 1100 foot long, 40 foot high, masonry gravity dam with a storage capacity of 200 million gallons at normal pool elevation. The dam was originally constructed in 1907 to supply water to the Pennsylvania Railroad, but is now owned by the Highridge Water Authority to supply domestic water to the Tubmill Water Filtration Plant for its customers in Westmoreland and Indiana Counties. Gibson-Thomas Engineering oversaw the preparation of a Hydrologic and Hydraulic Report and Breach Analysis in conjunction with preparing the Emergency Action Plan for this structure. Currently, a subsurface geotechnical investigation is underway to complete a Stability Analysis for this dam to satisfy PA DEP requirements.


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Gibson-Thomas Engineering Co., Inc. is a multi-discipline consulting engineering firm established in 1916 in Latrobe, Pennsylvania. Our past experience, key staff and commitment to total client satisfaction are the major factors that our clients consider when contracting with Gibson-Thomas Engineering.

724-539-8562
Corporate Office
  • Corporate Office
    • 1004 Ligonier Street
      Latrobe, PA 15650
    • P: 724-539-8562
Pennsylvania Offices
  • Clarion Area Regional Office
    • East Brady, PA
    • P: 724-526-2190
  • Harrisburg Area Regional Office
    • Camp Hill, PA
    • P: 717-612-9880
  • Indiana Area Regional Office
    • Indiana, PA
    • P: 724-471-2246
  • Pittsburgh Area Regional Office
    • Wexford, PA
    • P: 724-935-8188
Florida Office
  • Fort Myers Area Regional Office
    • Ft. Myers, FL
    • P: 239-776-2908
Virginia Office
  • Virginia Office
    • Richmond, VA
    • P: 804-672-4221