The awards come hot on the heels of council reissuing a warning to boaties the Te Matau a Pohe bridge may be closed for periods days over 26C, as steel expansion means it could potentially jam.
Because it was such an innovative piece of infrastructure, it was possible engineers were going to encounter the occasional glitch such as steel expansion in hot weather, Mr Weston said.
"It's something we are working through currently."
Engineering Excellence awards panel judge Peter Higgs said it was a pleasure to announce the team behind Te Matau a Pohe winners of the supreme award.
"It's a well-deserved accolade that we hope will also inspire others to continue to integrate excellence in design with New Zealand's unique cultural identity and ingenuity.
"It's an outstanding achievement," he said.