Rock Channel

The Rock channel dries at low water springs but is a possible short cut to/from the west at other states of the tide.

Coming from the west, the Meols Buoy (yellow: Pipeline, aka Sewer) is a good offshore mark. Then one has to get around the sandbanks by following waypoints: Rock, Corner, Chip. Then pass close to (and north of) the perch (no. 11, fixed green light) at the end of the groyne which heads NW from the Perch Rock Lighthouse. Beware strong currents near the groyne: heading for the groyne itself and then turning to port near it to round the perch is optmium. In this area the sea state can be very confused (as the waters from the Rock and Main channel mix). The confused water is usually the deepest part. From the perch head for Brazil Buoy. Do not head for the next perch (no. 12) since there is a shallow area protruding between the two groynes.

Although many wrecks are charted, only two showed in 1995 at low water springs and then only by a metre or two (see Wrecks of Liverpool Bay Vol II for images) - these are charted as drying 3.6m and 3.9m. I surveyed them in May 2016, and the latter one gave a small and isolated sonar return (see here) -- suggesting that they may no longer dry.

In March 2017 I re-surveyed the Rock Channel near waypoint CHIP (the shallowest part) and found that the Brazil Bank edge had moved South so that my CHIP waypoint was quite close to the northern edge of the channel. See here. I have moved the waypoint 100m south to re-locate it centrally in the channel. This survey also suggests that the depth in the Rock Channel has increased - and that it does not now dry at extreme LW [CD].
  I passed through the Rock Channel surveying most recently in April 2019, and my depth survey confirmed the track between my waypoints (central to plot) as drying less that 1m at CD [Lowest Astronomical Tide].

Note that locally laid (and unlit) buoys are often to be found close to waypoints Chip (race mark: yellow sphere marked WYC CHIP) and Corner (black buoy). On 13 May 2015, only Chip was present. Another race mark "Lagoon" was close SE of the Southern end of the west training wall.

Waypoints used by me (my boat draws less than 1 metre). Do not rely on these - check yourself near HW first.

Bearings (out/in going): Perch to Chip 271/91 degrees; Chip to Corner 279/99 degrees; Corner to Rock 294/114 degrees: Rock to Meols(Pipeline) 267/87 degrees.

Several times a year (latest Aug 2016; April 2017; April 2018 and April 2019), I follow these waypoints and find minimum water depth corresponding to seabed at 2 metres (or less) above Chart Datum (between Chip and the perch at the end of the groyne). From Rock to Meols (Pipeline) you cross the tail of the North sandbank with seabed level corresponding to 1 metre above Chart Datum. So at half tide (5.2 metres above CD), you should have a minimum depth of 3 metres in the Rock Channel.

Images of my tracks and depths from 2014 - 2019 (units metres; depths from CD):
Overview of N Wirral Coast (Hilbre Swash to west, Rock Channel to east, Meols access to south)
Bar in Rock Channel (waypoint Chip to west; Brazil Bank near centre, end of groyne (No 11) to east);
Crossing E Hoyle Bank/Spit (Hilbre Swash to west and East Hoyle Spit to North (best route just dries only at very low tides).

A record of the depth and track of all my voyages (from 2013) is also available from teamSurv . Note that some of the sand banks seem to have moved during this period.

The chart of the Rock Channel area is from surveys around 2004 and earlier and shows a discontinuity between different surveys. I have surveyed this area myself (see images above). The chart shows another possible LW route that runs close to the western side of the southern end of the training wall and then snakes between sandbanks (Murphy's gut). This route does exist and does have greater depth in part but it is not very practical since it runs so close to a solid obstacle: the training wall which is a line of concrete/rocks that dries up to 2.5 metres or so. Even more worrying, I find that the precise location of the training wall is different by 20 metres or more (it is further east) from that charted in this region. See my 2016 to 2019 survey of Murphy's Gut [lines represent charted training wall] and 3-D image of the narrow Gut between the Brazil bank and the Training Wall.
  See also an image near LW (0.6m above CD) showing the narrow Gut between the Brazil Sandbank and the Training Wall.

Zoomable chart from Navionics.

Some extensive information (some historic too) from Liverpool Yacht Club here . Now updated to 2018. This gives waypoints which are a little different from mine.

See also a 2014 guide from Liverpool Sailing Club.

Historical Information: Denham's 1840 Sailing Directions to the Rock Channel (also contains information on lighthouses, northwest lightship and lifeboats).

Map of Perch Rock area

Perch Rock Fort and Lighthouse

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