The Park Canal 04: the Limerick weir

The Irish cargo cult manifests itself in the belief that, if a town gets connected to a navigable inland waterway, boats carrying rich tourists and holidaymakers will arrive, spend large amounts of money and invigorate the economy. Moreover, further visitors will come, by road, to gaze upon the boats, spending even more money locally. And the whole place will come to look like Monte Carlo or suchlike, providing nice backdrops for photos in the tourist photos and thus attracting yet more visitors.

The Limerick weir in October 2010

Limerick has already tried this. In 2001, a sewer was being laid down the bed of the river; a weir was put on top of it to ensure a minimum depth of water in the Abbey River. Three sets of moorings were installed, but the proposed service block (with toilets and showers) was never built.

The building of the weir: photo shows the bed of the Abbey River

I do not know whether any formal analysis of the development has ever been done, but on the whole I suspect that is has been a failure. There had been four problems with a passage through Limerick:

  • at low tide, there might not be enough water in the Abbey River (notably from the Custom House/Hunt Museum up to Baal’s Bridge) for boats to navigate
  • at high tide, there might not be enough clearance (air draft) under Baal’s Bridge
  • there was nowhere safe to moor a boat in Limerick upstream of the dock
  • the current in the Abbey River could make navigation dangerous or even impossible.

The new weir did provide a minimum depth in the Abbey River, but it may also have prevented river-borne silt from being washed down to the estuary. In 2010 I was on a boat that touched bottom in the Abbey River; most of the Custom House moorings were unusable throughout 2011 and the entrance to the canal harbour from the Abbey River was completely silted up: extensive dredging was carried out in the winter of 2011.

The entrance to the canal harbour from the Abbey River in May 2010

The weir did nothing about the air-draft problem; at the official opening of the scheme in 2001, one boat (more used to the sea than to rivers) lost its radar arch against a bridge. However, this restriction can be avoided by timing any journey carefully.

Limited headroom under Baal's Bridge near high tide

Three sets of pontoon moorings were installed as part of the improvement scheme, but two of them are effectively unusable. Those outside Barrington’s Hospital are subject to strong currents; furthermore, boats moored there are vulnerable to attack by missile-throwing miscreants on the banks.

Pontoons outside Barrington's ospital

That second problem also applies to the Arthur’s Quay moorings.

Smashed light fittings on the Arthur's Quay pontoons

That leaves only the Custom House moorings, which are safely tucked away behind the railings of Sarsfield House and the Hunt Museum.

Boats at the Custom House pontoons at the opening ceremony in 2001

Some of the spaces are usually occupied by harbour-hoggers: folk who are unwilling to pay for moorings for their boats and who ignore Waterways Ireland’s five-day limit (seven days in a month) between 1 April and 31 October.

But the weir did nothing to reduce the problems caused by the current in the Abbey River: it is said that Waterways Ireland once recorded a peak current of 10.3 knots under the bridge.

Water flowing into ...

... and out of the arches of Mathew Bridge in the floods of November 2009

The strength of the current is a function of the state of the tide, the number of turbines running at Ardnacrusha and the flow caused by recent rainfall.

Extract from Waterways Ireland Marine Notice 1 of 2012

The secret to a safe passage is to wait until the incoming tide balances the current coming down the Abbey River. (That of course means that, on any one day, there may be only one brief period when passage is possible in daylight.) If you’re moored at the Custom House and heading upriver, it’s easy enough to tell when that is happening, but if you’re upstream at Ardnacrusha, coming downriver, it’s impossible to tell.

Ex-GCC motor-barge 68M getting it right in May 2008

Most hire firms will not allow hirers to take boats down to Limerick; even many private owners are reluctant to tackle the journey. Had it not been for the sterling voluntary efforts of Pat Lysaght, even fewer would have done so since 2001.

Pat Lysaght

There is one further factor that reduces the number of inland boats visiting Limerick and that is its position at one end of a large connected waterways system. Some boats stay in Limerick on passage between the estuary and the lakes, but for the large number of inland boats a trip to Limerick requires far more organisation and planning than most Shannon trips. It may require a full day for the trip in each direction.

None of this is intended to deny the considerable pleasures of a boat trip to Limerick: a passage through Ardnacrusha is an amazing experience and the river trip from there is surely the best possible way of entering Limerick.

Ardnacrusha: looking up at the top chamber from the bottom

So would reopening the Park Canal help to attract more boats to Limerick? See The Park Canal 05: cruisers from the Royal Canal.

4 responses to “The Park Canal 04: the Limerick weir

  1. I am glad you have written this, now when I am asked why I don’t think the plan to re-open the canal as a gateway to the university would work I can point them in this direction. Thank you.

    (Pat does look great though)

  2. Whoever compiled that report hit the nail on the head. The weir: disaster. The canal: disaster, despite the millions spent on it, The section from Park Bridge to the river must be the worst stretch of public canal in the country, completely overgrown by bushes and trees. If the lads in the EEC saw it they would look for their money back.

  3. Brendan Dillon

    Yes,, as a local person and Limerick born and bred it would be great to see the Park Canal get much needed attention,, not only for boat users or tourists but for locals and the great city that is Limerick city.. Such work along the Canal beautiful walks have been maintained and cared for by organisations who take pride in our great city. This work should be continued to further enhance the city,, such is that in other Cities,,like the capital.. Dublin.

  4. Making it navigable would be a complete waste of a very large amount of money. The walkways are being improved; any spare funding might be spent on the Black Bridge. bjg

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