"The teams will get to the site via the path that is already in existence," said Yves Naffrechoux of the local mountain police.
Authorities are hoping to identify more DNA strands from the 150 people who died in Tuesday's crash, as well as locate the jet's second black box that should provide more clues as to the circumstances of the tragedy.
Forensic teams have isolated almost 80 distinct DNA strands from the pulverised aircraft and have described the grim task as "unprecedented" given the tricky mountain terrain and the speed at which the plane smashed into the rock.
The flight, en route to Duesseldorf from Barcelona, crashed into the mountainside at a speed of 700 kilometres (430 miles) an hour, instantly killing all on board.
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Authorities are hoping to build a more sturdy road to the crash site -- both to ease access for forensic experts and for families who want to see where their loved ones perished.
A bulldozer and several specialised machines were already working away at the site to bolster the road access.
"The majority has been German and Spanish families but we've also had people from Mexico, Japan, Colombia, Venezuela or Argentina," he said.
Wagner said Germanwings and parent company Lufthansa had 90 people on the ground to care for the families, including around a dozen psychological counsellors.
He reiterated that the company had announced it would immediately compensate each family to the tune of 50,000 euros (USD 54,000).
This sum would not be deducted from any final compensation deal, he stressed.
As on previous days, there are about 50 personnel at the crash site, he said.
"The black box has been the major target from the beginning and even more so today," he said.
Authorities say the working conditions at the inhospitable crash site have hugely slowed their progress.