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Eel ladder at the Chambly dam

Chambly, Quebec, Canada

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The Richelieu River, an outlet of Lake Champlain, empties into Lake Saint-Pierre near Sorel. Juvenile eel migration in the river is hindered by two obstacles: the Saint-Ours dam and the Chambly dam.  

The Chambly dam, located 70 km from the river mouth, is a concrete weir built in 1965 whose function is limited to maintaining the upstream water level. The eel ladder, designed and manufactured by AECOM and installed in 1998, consists of a substrate with molded plastic studs inserted in a thick aluminum casing. After climbing the eel ladder, the eels fall directly into the Richelieu River, or into a net pen where they can be collected.  

AECOM has been monitoring eel passages at the Chambly dam since the eel ladder was commissioned. A photoelectric counter, developed and supplied by AECOM, records eel passages. The counter’s accuracy is periodically validated by comparing its estimate with the number of eels captured during a given period. A communication system linked to the counter enables daily transmission of counts and remote access to its operating parameters. The length of collected eels, or of a subsample, is also measured every two weeks. Finally, a data logger monitors water temperature at the exit of the ladder. 

Every week during the operation season, an AECOM team performs on-site monitoring and maintenance.

Tasks include:

  • Verification of the ladder flows and the eel counter computer system
  • Physical inspection of the ladder components and capture setup
  • Eel size measurements
  • Production of the operations report

In 2020, Milieu Inc. was purchased by AECOM. Key staff and expertise were retained and this project is presented as a combined expertise through time.