Northland Regional Council Kaitaia area manager Peter Wiessing said any proposal to divert the river would be unlikely to succeed, however.
"We have to give effect to the national coastal policy, and interfering with the stream or laying a hard surface are not permitted activities," he said, although "minor activity" to allow access would not be a major issue.
Patau Tepania (Te Rarawa) said on Friday that people had to start working with Mother Nature rather than against her. The Kaka St access had been designed to suit people's needs, and wasn't working any more.
He suggested looking for another access, such as the one that was once available off Korora St, which had been closed by the council for reasons that he could not explain.
Meanwhile commercial fisherman Ginty Morrogh said losing the Kaka St access meant he had to launch his boat off Foreshore Rd, which was a "big hassle", not least because the boat was over-width for the road, but losing the access would not prevent him from working.
Mr Radich said later that iwi had made it clear that they did not wish any effort to be made to divert the river, and that nature should be allowed to take its course.
"Hopefully the situation will fix itself," he said, adding that he would be looking into reopening the access off Korora St.
Mayor John Carter said the concrete blocks would be removed from Kaka St if and when it became safe to do so.