The Derbyshire town was evacuated last week following damage to the Toddbrook Reservoir.
Work by Kier, its supply chain, the RAF and emergency services led to water levels being reduced and residents allowed back home.
The Kier team has worked around the clock on site since the start of the emergency installing submersible pumps and over a kilometre of associated piping.
They also removed three weirs, provided 700 tonnes of stone for the RAF to drop using chinook helicopters and 400 tonnes of grouting.
Eddie Quinn, director at Kier Regional Civils, said: “The situation at Whaley Bridge was tense and at sometimes dangerous. I’m very proud of our team and supply chain for quickly coming together to help the Canal & River Trust and residents in the area.
“Working together, we quickly got the first water pumps into service and have been able to pump water out of the reservoir quickly.
“Reacting quickly has highlighted our ability to support our clients in their times of need, utilising our expertise regardless of the timing or breadth of project.
“It has been heart-warming to see the various organisations, as well as the local community come together during this time and we’re so pleased that residents are able to get back into their houses.”
Richard Parry, Canal and River Trust chief executive, said: “We would like to thank Kier and its supply chain who have reacted very quickly to this emergency and worked tirelessly since last Thursday to reduce water levels and stabilise the dam.”