Wednesday, March 21, 2018


Scope of Work
Cianbro rehabilitated and upgraded a 125 ft high gravity dam with a 288 ft wide spillway containing 20 billion gallons of water from the Loch Raven Reservoir.

Project Details Cianbro:
  • Replaced the top four feet of the concrete spillway crest section
  • Drove 57, 12 inch diameter rock anchors through the dam into bedrock
  • Placed 50,000 cy of roller-compacted-concrete (RCC) conveyed 1/4 mile from the on-site plant
  • Placed 25,000 cy of conventional concrete in the Spillway Facing, Training Walls, Flip Bucket and Dragon Teeth 
  • Replaced 140 feet of 120 inch diameter Pre-stress concrete cylinder pipe
  • Installed a new 60 inch valve for reservoir flow control
  • Fabricated and installed a water-tight steel door closure system to seal access roadway in major storm events
  • Removed / rehabilitated Intake Screens, Sluice Gates and replaced two Motorized Trash Racks
  • Cleaned and inspected one mile of 120 inch diameter PCCP, upper & lower galleries, replaced observation deck portions and erected new steel supports 
  • Installed 2,500 amp construction temporary service and upgraded lighting and electrical systems

Project Awards

ABC National Excellence in Construction

American Council of Engineering Companies Award of Merit

American Society of Civil Engineers Outstanding Civil Engineering Achievement

American Public Works Association Project of the Year

AGC Build America Award

Mid-Atlantic Construction’s Best of 2005 Award of Merit

Unique Challenge

The ASI/Cianbro project team managed the first part of reconstruction with no water supply interruptions and maintained schedule during one of heaviest seasonal waterflows recorded. Designed and fabricated a unique slip-form machine used in place of casting multiple facing panel sections.

Project Information

City of Baltimore

Joint Venture:

Type of Project:
Hydroelectric & Dam

Construction Schedule:
Completed September 2005

Baltimore, MD
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