Heard wall is safe as water is lowering at the moment but look at this picture
https://www.facebook.com/photo.php?fbid=382339735161332&set=a.228539367208037.57736.100001559278107&type=1&ref=nf
Position here
https://maps.google.co.uk/maps?saddr=Hollin+Bridge+St%2FB6447&daddr=Blackburn,+Blackburn+with+Darwen,+UK&hl=en&sll=53.736988,-2.49615&sspn=0.002399,0.004823&geocode=FQL2MwMdOOfZ_w%3BFV8jNAMdFwva_ymZQboEF3R7SDFCWpDnRhBHNw&t=h&gl=uk&mra=mift&mrsp=0&sz=18&z=18