THE extensive list of river crossings that need to be either rebuilt or repaired throughout the country are proving to be some of the most challenging works for MWH Global, the engineering consultant contracted to the Fiji Roads Authority.
MWH Global's technical delivery manager Don Clifford said it would take time to get through the list of crossings to be worked on.
"Many are deep inland," Mr Clifford said. "Getting people and materials to the site is time-intensive and costly. Some are several hours from a main road. But all the reasons we are finding these projects a challenge, are the reasons they are such a priority."
He said simple crossings were easy to put in but did not last and it would take hi-tech experts to make reliable, permanent solutions.
"The reason many have failed isn't that they weren't strong enough, it was caused by the failure of individual components."
He said the work was incredibly weather dependant and compounded by logs and debris washed down by heavy rain.
"The design must take into account of these loads, which put pressure on the completed structures and cause them to overflow."