Fianna Fail's Joe Flaherty feels more needs to be seen despite a two stage public consulation.
A Midlands Senator says he won't be supporting the modernising of byelaws for the River Shannon.
It comes following a meeting discussing updating byelaws for key waterways for River Shannon, Grand Canal, Royal Canal and Barrow Navigation to create a clearer framework improving safety, environmental protection and management.
The measures follow a two-stage public consultation process that drew over 900 submissions.
Fianna Fail's Joe Flaherty says he wants reassurances before committing his support:
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