Here is a series of aerials showing when it came and went.This one is when it appeared (there was no 1958 or 1959 aerial). You can hit NEXT until it starts to vanish in 1999.https://www.broadripplehistory.org/images/pictures_waterways/album_page_24.htm
This is when the BR Art Fair was held on it:https://www.randomripplings.com/issues/2022/20220901/rr_13.htm
Another aerial and a photo of it coming down:https://www.randomripplings.com/issues/2016/20160219/rr_1.htm