yep!, 1 month ago it is perfectly ride able, but the section between the power station and the Tilbury fort (well the bit I rode on) was at the bottom of the wall, so is only rideable when the tide is out, there must be a route 'behind the powerstation and and sewage works. the lower track ends abruptly, and you'll have to climb the steel staircase just after the sewage works, (coming from coalhouse fort end).
Look out for where the bank has collapsed, an hundreds of Victorian earthen ware jars and bottles re uncovered. Take a bag for somefreebees, but also take gloves, coz its downsteam of the poo works.
WP_20171110_12_40_43_Pro by
mark tilley, on Flickr
WP_20171110_12_42_10_Pro by
mark tilley, on Flickr