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Chicoutimi Spillways - Arnaud Bridge and Garneau Falls

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  • Hydro-QC - Évacuateur crue Pont-Arnaud Chute-Garneau_1g.jpg
  • Hydro-QC - Évacuateur crue Pont-Arnaud Chute-Garneau_2g.jpg
  • Hydro-QC - Évacuateur crue Pont-Arnaud Chute-Garneau_3g.jpg
  • Hydro-QC - Évacuateur crue Pont-Arnaud Chute-Garneau_4g.jpg

The July 1996 flood destroyed these Chicoutimi River spillways. Pomerleau was contracted to recreate them, incorporating the revised calculations for probable maximum flood.

Working in winter on sites 2 km apart and with an extremely tight schedule, Pomerleau placed 15,000 m3 of concrete in 3 months (170 pours), used 150,000 tons of granulate for the cofferdams, and excavated an area of 50,000 m2.

The spillways cross the river within about 50 m of their original locations. An 8 m wide service bridge tops each. Pomerleau also constructed water intakes for possible future power stations.

Garneau Falls Spillway:

  • 80 m long by 6.25 m high;
  • 5 channels with heated mechanical floodgates and releasable stop logs;
  • 90 m long by 14 m high rockfilled dam on the left bank.

Arnaud Bridge Spillway: 

  • 40 m long by  10 m high;
  •  2 channels with heated mechanical floodgates and 2 with releasable stop logs;
  • 60 m long by 14 m high rockfilled dam blocks off the headrace.
Type of project :
Energy
Tags:
hydroelectricity
Location:
Saguenay View map
Type of service :
Self-performed work, Health and safety, Insurance
Year of construction :
2003
Similar projects :
  • Hydro-Quebec, Administrative and Service Centres (13 projects)
  • LG-1 Hydroelectric Generating Station
  • ABB - Poste de l'Outaouais
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Pomerleau
521, 6th Avenue
Saint-Georges, QC
Canada G5Y 0H1

Phone: (418) 228-6688
Fax: (418) 228-3524
E-mail: eric.lessard @ pomerleau.ca

Website: www.pomerleau.ca
Printed on: September 27, 2016