As reported in Hayle Pump 110 http://www.haylepump.org.uk/documents/HAYLEPUMPISSUE110s.pdf

Footpath to the Weir Closed

The path down to the weir is temporarily closed over Carnsew Quay behind Jewsons. This is to permit development work connected with repairing the sluice gates and tunnels to re-introduce sluicing. The alternative rote is the long way around Carnsew basin/pool joining behind the old Mitchell the Printers, or by the Tempest building at the start of Hayle Causeway. This will be for a matter of months.

From http://www.cornwall.gov.uk/default.aspx?page=21752.

Notice is hereby given that Cornwall Council has made the above Order dated 26th June 2013 prohibiting the use by through traffic of the undermentioned length of road at Hayle. This restriction is necessary for development works. It is expected that the Order will be in effect from 1st July 2013 to 1st January 2014 (24 hours weekends included)

Footpath Closed

Footpath 16 between grid references 155518:37513 and 155652:37338