After about 18 years of restoration, of the canal were formally re-opened on 10 May 1991. The western section from North Warnborough to Basingstoke remains un-navigable from the point at which it enters the Greywell Tunnel. The tunnel partially collapsed in 1932 where it passes from chalk into clay geology, and is now inhabited by a protected bat colony making it unlikely that the tunnel will ever be restored. Some of the former canal basin at the western end has also been lost to modern development in and around Basingstoke.