Only three of the 29-to 36-tonne containers are still missing. Twenty-eight others have been recovered, while one other is secured and out of the shipping lane, said water police spokeswoman Christine Esbach.
The German ship Excelsior lost the containers from its load on Sunday and authorities had hoped to have the river reopened initially by Wednesday, then extended that to Friday.
But by Friday evening, it appeared that the 20-kilometre stretch of the river affected would remain closed at least into the weekend, Esbach said.
"It will be difficult" to find the other containers before then, she said.
Once the containers are found and it is determined to be safe to open the river again, shipping traffic should be back to normal within about two hours, she said.
The Rhine, which originates in the Swiss Alps, runs for more than 1,000 kilometres - much of that through Germany - before discharging into the North Sea in the Netherlands.
During
this winter's CN Rail strike, our brokers and our logistics
staff were kept busy keeping our clients shipments as close to
on time as possible. And we succeeded in getting rail shipments
across the Canada US border efficiently. It was a
stressful time, and we thank our clients for their understanding,
and for their compliments on our efforts.