Robinson’s swing bridge opened at Dock 1 in October 1886. It was built from steelwork shipped from England and it pivots to allow ships to enter the dock. It replaced an earlier bridge that spanned a narrower entrance.

According to the City of Port Adelaide Enfiled:

It was 129 feet long, 36 feet wide and had footpaths on either side. The bridge was operated by two people with a key turned by a hand lever. A line of rails passed over the bridge to allow freight access to the wharves. Robinsons Bridge closed in March 1935 and demolished in October 1935.

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References: 

Local History Collection, City of Port Adelaide Enfield, https://www.flickr.com/photos/paelocalhistory/11185500054/in/photolist-rNct3w-i3qmPz-i3qBtd-rvHCcc-qRo5Dn-i3qBrE-qRdrzS-rN4B6b-rN6dqX-rtScav-i3qmKM-i3qBmQ-jWiov2-rvCrts-qgMLkq-rN9joc, accessed 28 September 2017

South Australian Weekly Chronicle, 29 September 1883, 'Marine Board'  p. 7.