Boat cruising in the Dee Estuary

Jump to Charts and buoys; Local Knowledge; My trips.

Also info on Rhyl; Crossing East Hoyle Bank; Meols access; Thurstaston access.

I live overlooking the Dee estuary and I make occasional visits to the Dee in my workboat (based in Liverpool) including trips up to Connah's Quay, Queensferry and Chester and several overnight stops. I have also sailed and motored in smaller boats, launching at West Kirby, Thurstaston, Meols and Heswall as well as going from Chester up the river Dee to beyond Farndon.

Here I collect what I know about the Dee estuary. I should be grateful to receive any relevant information from anyone who can correct, add to, or improve anything contained in this guide. (email:

The Dee in a nutshell: there are three buoyed channels in from Liverpool Bay (i) the Welsh Channel close to Point of Ayr (ii) the Mid Hoyle Channel and (iii) Hilbre Swash passing close to Hilbre Island.

The upper Dee is canalised and is accessible only around HW. In principle boats can reach Chester. Above Connah's Quay there are bridges with air draught of 4.5, 4.0 and 3.8 metres at HW Springs. There is a bore on the flood at some spring tides.

The Dee estuary is littered with sandbanks and only a small area of sea remains at LW. Currents can be strong.

Commercial traffic comes to Mostyn Dock (using the buoyed and dredged channel). Mostyn is not a dock as such but a quay protected by a wall. It has no facilities for leisure boats. The only cargo carried above Mostyn is by a specialist boat (the AFON DYFRDWY with small draught and small air draught: 1.5m draught with 4.3m air draught) which brings Airbus wings from Broughton to Mostyn where they are offloaded for shipping to France. (She follows the buoyed channel marked by West Bar and Dee no. 1 to 10)

High water is 17 minutes before Liverpool at Rhyl, 14 minutes before at Mostyn, 10 minutes before at Hilbre. Connah's Quay is 10 minutes after Liverpool and Chester 68 minutes after.

There are boat moorings (mainly summer only) off West Kirby and off Thurstaston. View. There are muddy gutters which provide shelter and some quays providing alongside berths, the best being at Connah's Quay.

The most popular cruising destination is the SE corner of the West Hoyle Bank at LW. A big area of clean sand appears and it is a sheltered spot to dry out or go ashore by tender. A large colony of seals can be watched from here.

For orientation here are sketch maps of the middle and upper Dee (from Dee Conservancy):

Dee estuary channel

Upper Dee channel

Tidal information in the Dee from the Admiralty but expressed as height in metres above/below OD datum - basically mean tide level.
Liverpool4.272.37-2.03 -4.13
Hilbre I 4.072.27-1.83 -3.63
Mostyn 4.002.20??
Connahs Quay 3.952.25-0.75-0.75

At both Connahs Quay and Chester there is a low water stand (level depends on fresh water coming down the Dee) and then the flood tide comes in rapidly (at Connahs Quay: from HW[Liverpool] -2h until HW + 5' at springs and 15' later at neaps; at Chester from HW [Liv] - 40' or later until HW +1h 10'). On a big spring tide, this initial rise can form a bore. The ebb at Connahs Quay lasts 6h 30' at springs, 5h 40' at neaps. At Connah's Quay, the mean spring rise is quoted as 3.4m and mean neap rise as 1.7m implying a level of the low water stand of about 0.55m above OD. At Chester the mean spring rise is quoted as 2.4m (also as 2.8m or as 3.0m) implying a level of the low water stand of 2.2m above OD. At Chester the highest spring tides (HW above 9.1m at Liverpool) can overtop the weir and a 10m tide allows a boat with draught 0.9m to cross the weir in principle.
Info about a narrow boat trip in 2004 across weir. Image (2014) of the weir-gate which can, in principle, be opened to give more depth when a boat crosses the weir.
The Dee bore arrives at Connahs Quay about 1h 45' to 2h before HW Liverpool, reaches the Saltney footbridge about 30' later and finally, much reduced, it arrives at Chester Weir about another 30' later. See Bore pictures.

Dee Conservancy

The Dee Conservancy gives details of the state of the Dee estuary with quite a lot of detail about the upper section to Wilcox Point (including photographs). The buoys (West Bar and Dee no. 1 to 10) are maintained by the Dee Conservancy Harbour Master (tel 01244 371428; e-mail:
See their website for Notices to Mariners, etc..

Be aware that the channel changes frequently.

Above Wilcox Point the authority is Chester City Council. It is possible in theory for shallow draught boats to cross over Chester weir on a very big spring tide. See more info about the weir and boating on the upper dee

pdf file: Marine safety in the Dee Conservancy .

See also 2006 guide to Dee Navigation from NABO.

Coastline Survey

For a survey (with 4 photographs including one of the Heswall boatyard) of the state of the coastline around the Dee Estuary see pdf file: coastline survey of Dee Estuary [web access no longer available]

See also DEFRA survey and 2013 survey of Dee Estuary

A detailed report on Hilbre Island in 2003, see pdf file here

Hydrographic Office

The Hydrographic Office publish a chart "Approaches to the Dee" 1953 (previous edition 11-5-2006; new edition April 2012; newer edition December 2015). This had depth information in the estuary mainly from a 1987 survey of the outer part but this is now updated. The inner part is from a 1983 aerial survey - this information is mostly out of date. There is a discontinuity where these surveys fail to match.

The "Great Ormes Head to Liverpool" chart 1978 (later editions 14-5-2009 and December 2015) actually shows additional information somewhat further into the estuary.

Recent surveys of the channel into Mostyn Docks 3893/2004, the mid Hoyle channel 6000/2010 and the Hilbre Swash channel 2628/2011 were made available as pdf files in notices to mariners. For the current info see here and enter chart number 1953 then click "add" then "view selection". Also Mostyn info.

An updated chart of the entry to the Dee (nm1466/2012) to chart 1978 is here . Apart from the dotted section in the lower right corner, this seems close to the actual 2012 situation. Note that the 2015 revised chart is again different and seems to fit well with my 2015/6 observations. It also does not cover the inner estuary. It is now (2017) less accurate - missing some significant changes to channels/

For a visual comparison of these Hydrographic Office charts of different dates see here .

An up-to-date chart (zoomable) is available free from Navionics. This has the option to enable "Sonar Charts" which includes community input: this shows more information about the depths in the upper Dee -- but since the source appears to be solely input from me [ 2013 trip] -- I consider that the treatment of my input is unreliable except on my actual boat track.
In summary: I recommend to use the Navionics product as a way to view the latest Hydrographic Charts for free (but avoid the Sonar Chart option).

Buoyed channels into the Dee are the dredged South Hoyle channel (SH Outer,.. SH7 buoys); the Mid-Hoyle Channel (Hoyle, Mid-Hoyle, East Hoyle Spit and Dee buoys) and the Hilbre Swash Channel (HE1, HE2, HE3, HE4 buoys). The dredged channel into Mostyn is marked by M1,...M10 buoys. The channel up the Dee follows HE4, D1,....D10 or (from the west) M1, West Bar, D1,...D10. See here for some recent buoy positions. These buoy positions have remained the same for many years and (see local knowledge below) D9, D10 are no longer in the optimum position: but a spherical yellow buoy is used to mark the channel (see Notices to Mariners or contact for updated info). Also Dee2 seems (2016) to no longer mark the optimum route but is replaced by D1A. Note that (Aug 2017) Dee2 (now a port-hand buoy) has been moved to 53° 20.00'N, 3° 11.6'W to mark better the channel. Also Dee3 is now a starboard-hand buoy (at 53° 19.26'N, 3° 11.98'W as before). Dee1A is no longer close to the deepest channel.

Buoy positions in the outer Dee from a March 2010 (and later) survey by me.

Note that the South Hoyle and Mostyn dredged channels are a "narrow channel" and small boats must give way to ships constrained by their draught.

Ordnance Survey give the LW mark (for average tides) on their land maps. This is taken from aerial surveys. Earlier maps quote the date of survey (mainly 1970). Current maps show the same LW position as 1970 for much of the Dee estuary and no longer give the date of survey. This LW information is thus over 40 years out of date and is useless.

Note that the navigable channel in the Dee estuary used to be close to the Wirral shore and Neston, Parkgate, Burton and Shotwick were ports. See early charts (these are quite high resolution files).

The 1948 Admiralty Pilot gives information on wharves and quays giving maximum draught possible for access at HW Springs: Sluice House Gut and Colliery Wharf (near Talacre with 14 ft); Mostyn tidal basin (12 ft) and quay (19 ft); Connah's Quay and Steelworks wharf (12.5 ft); Queensferry wharf (10 ft); Saltney (9 ft) and Chester wharf (100-150 ton vessels reach it). At that date the two bridges below Connah's Quay both opened and the other bridges (below the rail bridge at Chester) were not yet built.

Local Knowledge

For a guide from a yachtsman see Dee Pilotage Notes by John Hughes.

For information on racing marks laid by yacht clubs see West Kirby S C and Dee Sailing Club [not live]

Satellite view and view of West Kirby/Caldy/Thurstaston area.

For places to visit at HW (Connah's Quay, Flint, Llannerch y Mor, Thurstaston causeway and Heswall), sketch maps are available - see chartlets from Dee Sailing Club circa 2008. See also channel up to Heswall in Feb 2014 and here .
  Note that the HO chart does not show the optimum route into the moorings at Thurstaston. What it shows is a "short-cut" that has much less water. For the correct approach see chartlets above or use my track (with depths) which is available from teamSurv .

At one time many small ports were in use: Talacre, Mostyn, Llannerch-y-Mor, Bagillt, Greenfield, Flint, Connah's Quay, Queensferry, Sandycroft. For aerial views of these "ports" as they were around 2006, see here.

Bagillt gutter with barges (flats) here (historical).

See here for History of the port of Mostyn.

More history: the 1870 Pilot to the Dee gives an insight into shipping trade at that time.

A summary of wrecks in the Dee estuary and its approaches

The "port" at Llannerch y Mor (next to the rusting hulk of the ferry Duke of Lancaster) has quays which are accessible near HW - but the uneven seabed contains rusty metal pieces and there is barbed wire alongside part of the inner quay. It would be possible to stop briefly on the outer quay near HW but, as of Feb 2015, the quay area is encircled by barbed wire, so access from the quay to Aberkhan (nearby textile shop complex which has a tea room) is not available. See photos of the entrance, the outer quay, the inner quay and the barge.

For more on the Welsh coast between Fflint and Bagillt: see here.

More images of Greenfield Dock, click here

Image of Bagillt Dee Banks Gutter at HW in 2010, click here

Image of Fflint Industrial Quay in 2010 at HW: click here

Images of the "pier" and "ramp" at West Kirby and the "causeway" at Thurstaston here

For information on bird watching in the Dee Estuary see here for a clickable map.

Dee area marine conservation information.

The Dee bore - for info see here

For some pictures and navigational information from my recent (2008, 2010, 2011/2/3, 2014, 2015, 2016, 2017) trips into the Dee, see 2008 , 2010 . 2011/2/3/5 , 2013 trip to Connah's Quay, 2014 trip to Chester, July 2015 trip to Thurstaston, April 2016 , May 2016 near LW , July 2016 , Sept 2016 and April, June, July, August and September 2017 .

Note 2017 report contains some waypoints that I find useful.

A record of the depth and track of most of my voyages since 2013 is available from teamSurv .

Images of the NESTOS (for more details see my book Wrecks of Liverpool Bay) here .

For Satellite photos of the AFON DYFRDWY loading dock at both ends of its voyages (at Broughton and Mostyn), see here

Hilbre Island webcam [not working]

Shortcut over East Hoyle Bank coming to/from the Mersey

When coming to/from the Mersey via the Rock Channel and Hilbre Swash, it is possible to cut across the East Hoyle Bank (East Hoyle Spit) at most states of the tide. On a straight line between Meols buoy(Pipeline) and HE3, the chart shows (2014) that the bank dries at most 1 metre above chart datum, but further west it dries up to 2 metres. In July 2014, near spring LW, I could see the end of East Hoyle Spit dry (so about 2m above CD) and that the dry section overlapped the direct line from HE3 to Pipeline. A better route would be to cross the bank further SE of this line: for instance heading from HE3 to my waypoint ROCK . Then least depth would correspond to about 1m above CD with the shallowest point being the northeast edge of the bank (so at half-tide with depth 5.2m above CD, there would be plenty of depth - as I found on earlier trips). See also 2016 info and my tracks and depths (in metres): Crossing E Hoyle Bank/Spit (Hilbre Swash to west and East Hoyle Spit to North (dries more than 2m)).


Rhyl information: drying harbour accessible HW +/- 2.5 hours with 4 ft under a workboat keel. The (opening) footbridge is now operational and limits access to the inner part of the harbour which has a pontoon for loading/unloading to the north-west of the harbour (it dries to an uneven bottom and needs a code for shore access).
Further in, the road bridge is passable with moderate air draft to give access to a further inner sheltered drying area. The rail bridge is further upstream and is lower and no powered craft should pass under it.
Before the footbridge, there is a pontoon in mid-channel which is used by the fishing charter boats. There is also a pontoon on the north wall which has access ashore (code needed to return).

Images of Rhyl harbour (2008) near LW here and here . Map of Rhyl harbour

Image of pontoons in outer Rhyl harbour on 3 May 2016 near LW during sand removal operations.

Note that harbour improvement works are not yet completed at Rhyl (info), for instance the air draught gauge is still to be provided. The harbour master is on channel 14 or call 01825 708 400 for information and for opening the bridge. There are three vertical lights ashore which show red when the bridge is closed (with an additional amber meaning the harbour is open to vessels with small enough air draught), and green when open.

Navigation information from Rhyl YC[link broken]
2014 Marlin trip to Rhyl