Investing in Clean Energy at Bagnell Dam

Bagnell Dam Exterior 

Construction began in March 2017 on a $52 million project installing a series of new anchors and concrete on the downstream side of Bagnell Dam, which provides power to 42,000 homes.

The approximately 18-month project consists of three parts: 

  1. New post-tension anchors will help hold the dam to the underlying bedrock; 
  2. Concrete will be added between the highway piers to add weight to the dam; 
  3. And, a new concrete overlay will replace worn and cracked concrete on the east and west sections.


The last major structural update to Bagnell Dam was completed in the early 1980s. At the time, 277 post-tensioned anchors were installed to hold the dam into the bedrock. They have performed very well since then. As part of its safety protocols, the dam is inspected annually by an independent safety engineer. As a result of a routine inspection, the engineer recommended that strengthening work begin by 2020.

This project by the numbers:

  • 68 new post-tension anchors
  • 66,217,500 pounds of new concrete, which is equivalent to more than 5,500 Asian elephants
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