Horizons Regional Council is working with river users to restrict on-water activities through Te Apiti - Manawatu Gorge as a safety precaution.
The gorge has been closed to traffic since two large slips blocked the road in April. New Zealand Transport Agency (NZTA) geotechnical reports have identified that rock conditions remain unstable and further slips are possible.
Horizons emergency manager Ian Lowe says due to the high risk of rock fall into the Manawatu River the Council has restricted on-water activities on the stretch of the river through the Gorge until further notice.
"Under our navigation safety function we are advising all river users to keep clear of the stretch between the road bridge downstream of Ferry Reserve and the confluence of the Manawatu and Pohangina rivers. Signage advising this will be erected at Ferry Reserve, the Ashhurst end carpark to the walking tracks and Ashhurst Domain.
"At this stage we are not sure how long this stretch of the river will need to be avoided. However, public safety is our top priority, and with the potential for large boulders to fall into the river, this restricted access is absolutely necessary."