"We whittled down a shortlist of very successful and experienced managers and Aidy stood out head and shoulders above the rest," Bradshaw told BBC Essex.
"He'll provide the club a level of profile and also a winning mentality to take us to the next level."
Bradshaw felt Boothroyd's Premiership experience with Watford would be a huge benefit to both the U's players and the club as a whole.
emp_load.getEmpEmbeddedParams("emp_8235631");"Aidy's managed at the top level, he's managed some of the most talented footballers in the country - people like Ashley Young and Marlon King - and therefore knows how to get the best out of some of the more talented players we have got," he said.
"He also has a real team ethic which is something we all want to buy into."
"This is a guy who wants to do the very best he can - he wants to help Colchester to achieve all it can achieve," he added.
"But he also wants to do it with a smile on his face and I think the fans will appreciate that and it's certainly something the staff around the building have already noticed."