Canberra's new Bowen Place Crossing has taken out the infrastructure category of the 2016 National Landscape Architecture Awards.
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The $15 million pedestrian underpass unveiled a year ago won the state award for "combining style and functionality" in June.
But on Friday, the Australian Institute of Landscape Architects announced it won the national Award of Excellence for one of the 12 categories that 40 projects across the country were fighting for.
Lahznimmo Architects designed the Bowen Place Crossing, which was built so cyclists, joggers and walkers could complete the Lake Burley Griffin loop safely.
The period of planning to completion was four years and was a "complex" process, now National Capital Authority chief executive Malcolm Snow said.
The project, which was also awarded the Sir John Overall Award for Urban Design at the ACT awards, was acknowledged for its successful competition procurement process and design-led outcome, according to the awards jury.
"The foresight to imagine the scope and possibility for an urban landscape element of poetic scale and enduring contribution, adjoining Lake Burley Griffin in the central national area, is the key to the success of the intervention," the citation read.