I need the exact height of the US-50 bridge over the Choptank River in Cambridge MD - Page 2 - SailNet Community
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post #11 of 77 Old 07-30-2017 Thread Starter
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Re: I need the exact height of the US-50 bridge over the Choptank River in Cambridge

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Swing the boom out, tie two buckets of water to the end so you heel over some.....and pray..🙏🏻🙏🏻🙏🏻🙏🏻
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Re: I need the exact height of the US-50 bridge over the Choptank River in Cambridge

Not to hijack, but for all you experts...here's a question.

Yea, I know, as an over educated mariner, MHW. OK, but where do they measure. If the bridge has some bend in it, it is lower near the pilings than the middle, are they measuring the middle highest point or the lowest point. I go under a 60' bridge at the beginning and end of the season with a 57' 7" mast. So far I've made it. Yes, I target the highest (middle) part of the bridge. Do I have to?
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Re: I need the exact height of the US-50 bridge over the Choptank River in Cambridge

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Originally Posted by capecodda View Post
Not to hijack, but for all you experts...here's a question.

Yea, I know, as an over educated mariner, MHW. OK, but where do they measure. If the bridge has some bend in it, it is lower near the pilings than the middle, are they measuring the middle highest point or the lowest point. I go under a 60' bridge at the beginning and end of the season with a 57' 7" mast. So far I've made it. Yes, I target the highest (middle) part of the bridge. Do I have to?
As in most things sailing.

It depends:

https://www.soundingsonline.com/news...hts-on-the-icw

The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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Re: I need the exact height of the US-50 bridge over the Choptank River in Cambridge

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Originally Posted by capecodda View Post
Not to hijack, but for all you experts...here's a question.

Yea, I know, as an over educated mariner, MHW. OK, but where do they measure. If the bridge has some bend in it, it is lower near the pilings than the middle, are they measuring the middle highest point or the lowest point. I go under a 60' bridge at the beginning and end of the season with a 57' 7" mast. So far I've made it. Yes, I target the highest (middle) part of the bridge. Do I have to?
The problem is that in some states, and to avoid unnecessary litigation losses, they measure at mid-channel / at the highest altitude of the (bowed) span .... AND THEN measure down to the bottom of any equipment or 'marker lights' dangling from that span. ... thats why most of the 65ft. bridges along the AICW in Florida are marked on the 'fender mounted' depth/height gages ... are routinely indicate MUCH less than 65 ft. !!!!! Reason: "lawyers"
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Re: I need the exact height of the US-50 bridge over the Choptank River in Cambridge

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If I remember correctly, the true bridge height over the Choptank at Cambridge is 'weird'.

Best would be to call the dock master at Cambridge City Marina (adjacent to this bridge) and speak to the dock master directly to ask for his 'advice'; and, not ask for 'official' information:
Cambridge Dockmaster Office (410) 228-4031
Well, for the record, here is what he said: The height is 50' (at dead center) but at mean lower low water!! I asked whether charts don't usually give bridge clearance at mean high water and he said he does not know about that but he believes for this bridge the listed clearance is at mean lower low

He said there are also lights etc dangling from the bridge and advised not to attempt the bridge with anything above 45'.

I may have to reconsider the trip.

Or I may take a car trip and dangle a lead line from the bridge to the water??
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post #16 of 77 Old 08-01-2017
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Re: I need the exact height of the US-50 bridge over the Choptank River in Cambridge

When is your trip?? I will be at the boat (Cambridge city marina) and can check for a draft gauge this Thursday evening.
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Re: I need the exact height of the US-50 bridge over the Choptank River in Cambridge

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When is your trip?? I will be at the boat (Cambridge city marina) and can check for a draft gauge this Thursday evening.
That would be wonderful! My trip is in September so plenty of time.
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Re: I need the exact height of the US-50 bridge over the Choptank River in Cambridge

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Originally Posted by capecodda View Post
Not to hijack, but for all you experts...here's a question.

Yea, I know, as an over educated mariner, MHW. OK, but where do they measure. If the bridge has some bend in it, it is lower near the pilings than the middle, are they measuring the middle highest point or the lowest point. I go under a 60' bridge at the beginning and end of the season with a 57' 7" mast. So far I've made it. Yes, I target the highest (middle) part of the bridge. Do I have to?
For some bridges, it says so on the chart. E.g. for the Kent Narrows fixed bridge, it says

"FIXED BRIDGE HOR CL 182FT VERT CL 65FT (FOR MID 75FT)"

Meaning you have 65ft for the middle 75ft of the span.

I don't know how NOAA determines whether to specify this or not. There is nothing like that for the Choptank bridge although I have been told that it is 'half-moon shaped'. My assumption is that the listed height (49.9') is for dead center only.
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Re: I need the exact height of the US-50 bridge over the Choptank River in Cambridge

Since moving my boat to the Eastern Shore / Kent Island I have been using the Eastern Channel under the Bay Bridge and I swear I looked at the vertical clearance the first time I did it??? This past Friday transiting under the same channel it seemed lower than normal for some reason so I checked the chart again and it said 58 ft! I'm 53 feet plus antenna... I can't say I wasn't a little nervous for a few moments.

Shawn


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post #20 of 77 Old 08-04-2017
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I took a ride under the bridge this morning and it does not have a gauge
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