Water supply to the Royal Canal: the feeders

By comparison with the Grand Canal, which had about fourteen feeders supplying the main line, the Royal seems to be almost a desert: I have found only five supplies. That may be because less has been published about its water supply, which receives comparatively little attention in either Peter Clarke’s The Royal Canal: the complete story (Elo Publications, Dublin 1992) or Ruth Delany and Ian Bath Ireland’s Royal Canal 1789–2009 (Lilliput Press, Dublin 2010). Furthermore, I have no map equivalent to that which I used for the Grand Canal, which was useful in naming the feeders.

Most attention has focused on the Lough Owel feeder, which supplies the summit level, but it was not (and is not) the only source of water. Here is a list assembled from personal observation and from the OSI maps of ~1840 and ~1900, the Guide to the Royal Canal of Ireland (compiled by Ruth Delany and Ian Bath and published by the Office of Public Works in 1994) and some information from Waterways Ireland.

The OSI surveyors working along the Royal seem to have been less interested in canal feeders, or perhaps there just weren’t as many. In several places they seem to have marked feeders with the letters CS rather than the words Canal Supply, making them rather harder to spot. As a result, I am not confident that this list is comprehensive and I would welcome additions, corrections and clarifications; please leave a Comment below.

Again, the list goes from east (Dublin) to west (the Shannon).

Ryewater supply, entering from the north just below 17th (Ferns, Ferrans) lock, west of Kilcock (OSI ~1900). There is a distortion in the online map at that point, but I assume that the sluice shown controlled discharge into the canal

Riverstown supply, entering from the north opposite the harbour at Thomastown

Pig’s Nostril, about half way between Baltrasna Bridge and Saunders Bridge east of Mullingar (OSI ~1900). This is a guess at the location, but it seems the most likely candidate; confirmation or contradiction welcome

Lough Owel Feeder (upstream end)

There is more about the Lough Owel Feeder here.

Ballynacargy harbour supply (which may be the Balroe supply: Balroe Bridge is at 34th lock, one up from Ballynacargy)

Is that all there is? Comments particularly from folk who’ve been along the Royal recently.

Update November 2012

The Inspector’s Report to An Bord Pleanála on the Royal Canal Water Supply Scheme PL 25.JA0030 and PL 25.PW3005 reports that Nigel Russell, WI’s Director of Technical Services, described the “sources of water to the canal”:

Apart from the summit Mr Russell noted that around Enfield there is some natural inflow as the canal is in cutting. There are two small gravity feeders in addition, the Thomastown feeder, a small stream, and the Rye water, which operate in flood weather conditions. The Boyne and Inny have been pumped over the last ten years and in times of low flow have been a significant source of water. In low flow the only Lough Owel derived water is from the fish farm. If it is considered that pristine Lough Owel water is the main source of water to the canal that is not accurate. Lough Owel supplies the canal during high water levels. At low flow times the canal sources are pumped water from the Boyne and Inny, Lough Owel water and Cullion fish farm recirculated water. […] Mr Russell indicated that the relative contributions of water at times of low flow could not be estimated. Losses of water through seepage is being addressed and illegal abstractions are being pursued. A large throughput of boats will give rise to large losses.

Update November 2018

Waterways Ireland is still pumping from the Inny into the Royal Canal at the Whitworth Aqueduct, north of Abbeyshrule, but the level is still well below normal.

The inflow from the pump

The water level on the aqueduct

The location of the aqueduct



17 responses to “Water supply to the Royal Canal: the feeders

  1. if memory serves me correct, there is a drain into the Royal just east of the 13th Lock at Blakestown. In Glasgow currently so can’t check on the ground.

  2. Thanks, Ewan. Nothing shown on the old OSIs, but I’m not sure that means very much! If you can check at some stage, that would be useful. bjg

  3. Update: memo to self: maps show things in two dimensions but in real life there are three. What I thought might be a supply from the Inny at Scally’s Bridge must instead be an overflow, as the canal is above the river at that point, having just crossed it on an aqueduct! Accordingly, I have deleted that from my list.

  4. Brian – apologies for the delay in responding. Drove by the 13th Lock this morning and there is a drain feeding to the canal – it is possible that it is runoff from the railway line. WIll send the photo to you by email.

  5. I walked the Royal in May and noted at least 3 pumped feeders, of which i photographed 2 (emailed). Of these, one was just past the McNead’s Bridge but before the lifting bridge. The second was at the Inny Aqueduct at Abbeyshrule.

  6. Brilliant; thanks Martin. How was the walk? I remember some years ago, going by boat, some sections of the towpath were pretty rough, but I haven’t seen all of it in recent years. bjg

  7. We were blessed wih 5 sunny days, thanks to which my memories of summer 2012 are good. The Grand is logistically easier ( 4 x c30km sections) but the scenery on the Royal is superior. No major or even minor
    obstacles en-route, I am looking forward to Minister Varadker’s plans to develop it further for cyclist and walkers. (Because there sure ain’t enough boats using it).

  8. Thanks, Martin. How did you arrange the sunny days? bjg

  9. Growing up beside the canal in Enfield I can tell you there is a stream feeding the canal between Enfield railway station Bridge and Cloncurry Bridge.

  10. Great: thanks for that information. bjg

  11. Pat_kennelly@ hotmail.com

    Just happened on this site whilst home on holidays last year and walking the canal at Killashee
    Very informative and especially love the very local aspects of the updates

  12. Thank you. bjg

  13. Cathal O Meara

    The arterial drainage ( river dredging) schemes of the 1950s-1970s have taken a few meters off a lot of water tables along the canal, and particularly the Boyne itself. So a lot of feeder streams no longer work for much of the year. You need a really wet summer to provide water for the locks.

    I understand that the extraction pump from the Boyne is not licenced and that it may be decommissioned. Licenced by what of our myriad quangos I cannot say , could be anyone from the EPA to Waterways Ireland to the NPWS or all of the feckers.

  14. Thank you. That is very interesting and informative. The implications of drainage had not struck me. bjg

  15. I’m not sure if the Rivertown supply, entering the harbour at Thomastown is actually entering the canal it seems to be getting piped under the canal at this point, the water seems to drop into a grate and there is no output flow into the canal also, the wall at this point has been undercut and collapsed and is just a shallow area in the harbour now. I understand some “explorers traced the river and found unrestored sluice gates similar to those being used on the lough Owel feeder. So even though this river is flowing I do not think it is entering the canal

  16. Thanks, Ben. You’re right about the sluice: on map.geohive.ie enter the coordinates 657910.769,750856.452 and you should land at the top of the feeder, which is itself fed by the Riverstown River. Under Data Catalogue, Base Information and Mapping, switch to Historic 25″ and you’ll see the sluice marked. Follow it down and you come to a T junction with another sluice. After that it gets a bit complicated: two branches head towards the canal, the one to the left being marked “CS”. Both of them seem to go under the canal but the right-hand one looks as if it has an outlet (a small arch) in the canal as well, and maybe that’s marking the blocked outlet. bjg

  17. Pingback: Garryowen and the Royal Canal | Irish waterways history

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