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Discussion Topic: Potter Heigham Bridge Height update
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Owl |
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With the high water levels around at the moment the clearance was around 5'7" 2pm today.
" Customer of the National Farce Family"
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TheCommodore |
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Hi Owl
Please correct me if I am wrong, but, zooming in, I read the board in your photo as 5' 8" or 68 inches. Or was the pic taken at another time?
Geof
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Owl |
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The picture was taken today from the Herbert Woods side which as you say showed 5'8" but I checked the sign the other side , by the pub , and that showed 5'7" . So I used the lower figure - as I am moored at Martham I tend to go by this one because it may give me a better safety margin.
The more you learn the more you realise you don't know.
Alan
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Scooter |
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Commodore, if you look closely you'll realise that you are both in violent agreemnent here!
Owl says 5'7" and you say 5' 7" - the difference is an extra space. Therefore, on Owl's post, the gap allows the ' to run into the next number and become 'lost'.
Chris(361H)
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expilot |
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For those with sufficient skill or bravery that one inch makes all the difference at Potter bridge a public health warning:
The gauge upriver of the bridge reads one inch pessimistic compared to the one on the downriver side. BOTH gauges are wrong and have been since they were re-installed by the BA.
The only "accurate" gauge is the one protected inside the pilot's office and visible through the office window. Just to confound matters, this one was set deliberaytely one inch pesimistic when it was installed.
To further compound the issue, the clearance beneath the downriver keystone is one inch greater than the clearance beneath the upriver keystone.
So that's cleared that up then!
PEDANTS AND ANORAKS UNITE! 
"There are old pilots. There are bold pilots............."
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PeteSanders |
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I always read the gauge in the Pilots Office, as you know Expilot, but following your last post, I`m now totally confused. As you rightly say, that 1 inch DOES make all the difference, so please advise from which gauge I should now require my 6` 8" of clearance, and to which keystone that relates? I always like to allow an extra inch clearance in addition to what you professionals risk!!
Pete
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Gordon |
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Hi all, I would appreciate some advice please regarding navigating through that little hole in the wall. I have been happily taking our little Elysian 27 through when the Pilot's guage said 6 6 but have now changed boat. We have now got a Wilds Calyso obviously mutch wider and a bit higher. The old hire plate says 6 10. What does that mean in relation to the gauge, ie where width wise does the gauge refer, I assume its not to the highest point.
I suppose the question is for that boat what do I want to be seeing on the guage, and what clearance would I get.
From reading the various postings it does seem that the hole is getting smaller and not in the same way as I am convinced that wagon wheels are a fraction of the size that they were when I was a kid
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Spider |
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Hi Gordon
I don't think you should place ANY reliance on the hire plate. They are usually wildly inaccurate, especially for a bridge like PH. I'd suggest that you ask one of the regular posters on this forum, expilot, for his advice or call the PH pilot's office on 01692 670460. They should be able to tell you the clearance you require to within a gnat's crotchet.
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expilot |
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Give or take "a gnat's crotchet" a Calypso will clear PH bridge at 6' 10" PROVIDED the boat is dead central to the arch and is running parallel to the arch sides (which are not parallel to the riverbanks) That said, because a Calypso has a very convenient foredeck, two reasonably sized adults sitting "oiut front" can reduce the required clearance by a good inch. This advice should be ignored if the crew on board consists ONLY of two!
And to what does the 6' 10" clearance actually refer? It certainly isn't the height from the water's surface to the bottom of the keystone. I simply don't know.
And to Pete, if the pilot's gauge showed 6' 8" when you passed the bridge cleanly you can be assured that your boat will always pass at that height as indicated on the pilot's gauge. When you're feeling brave try 6' 7" as shown by the pilot's gauge. If you hear a metallic rubbing noise comimg EQUALLY and SIMULTANEAOUSLY from both sides of the roof above your head, you have just left a permanent mark on a listed monument and have two grazed handrails. Your boat needs 6' 8" as indicated by the pilot's gauge.
Establishing a boat's required clearance height at Potter bridge really is that straightforward. As Pete says, the cheapest way is to ask the pilots and, until you get used to passage through the bridge, £3.00 to the pilot is VERY cheap insurance!
"There are old pilots. There are bold pilots............."
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Broads01 |
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Keep'em coming, expilot! Your posts on here are always really useful.
I'm guessing the pilots probably err on the side of caution (quite rightly), so getting them to take a boat when bits are likely to be scraped in reality is unlikely to be an option?
Simon
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Nov-03-2006 @ 6:17 PM
