"They've rebuilt an entirely new piece of highway in a superbly orchestrated blur of activity, and words can't express the value of their hard work for the Manawatu region and beyond."
Mr McGonigal said half-bridge repairs had been completed just up the road from the main slip site and crews had also finished protecting the hillside with netting.
He said NZTA was grateful to the people of Manawatu and beyond for their patience, perseverance and understanding over the last 15 months.
While the job at the Manawatu Gorge was now finished, NZTA would continue its focus on improving the Saddle Rd.
"We recognise the importance of ensuring the people of Manawatu have peace of mind in the form of a solid alternative route.
"We'll be working closely with Tararua District Council and Palmerston North City Council on the rehabilitation and upgrade of the Saddle Rd.
"The Manawatu Gorge is a vital lifeline. While the last closure was an anomaly in terms of its scale and duration, the reality is that closures will happen from time to time, and we need to be ready."