Queenstown Trails Trust chief executive Mark Williams said about 50m of the Lower Shotover Trail, on the Arrowtown side of the river, about 1km north of the Shotover Bridge, was affected by storms last week.
''It's a braided river and that section of track, obviously, has been eroded in the last storm.
''With the big rains last week the river moved quite a lot and it ate out a little bit of the bank where the trail was.
''We've put some warning tape up now and we're just going to cut a new trail ... that just skirts around that ... through some willows.''
Mr Williams said the section affected was not part of the Queenstown Trail ''great ride network'', but had been created as a grade three to four mountain bike trail about a year ago.
While the Department of Conservation shared responsibility with the trust for its maintenance, the trust would ''just do that [repair work] ourselves''.
''It's not a major investment for us.''
Consideration is also being given to realigning another part of the trail, near the Kawarau Bridge.
Last November the Queenstown Lakes District Council closed a section of the Frankton Arm track while a slip below it was stabilised and two trees were removed.
Mr Williams said the track at that point was was at the top of a ''relatively active face'' and consideration was being given to rerouting it to ensure it was far enough from the river to minimise future impacts.
''I guess you'd call it geography in action - the river's eaten in to the bank beneath and therefore it's moving.''
