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Old 02-15-2020, 12:47 PM   #81
DebNJim B
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Originally Posted by Cyride View Post
In our state the posted height is roughly 3 to 4 inches lower than the actual height (according to the Motor Carriers Road Atlas 2020). Not sure why that is, maybe for winter driving (snow load). Why don't you check with the Montana DOT to see if they have the actual clearance height. I'm sure if they have had some problems at that location they would be up to date with the actual height. We were up there a couple of years ago, if I remember correctly they were capping some sections of that road then. My garage opening is 14 feet and it is level going into the garage. I verified the garage opening height and parked the 5th wheel under it and measured the difference then did the math.
Few years ago while still working part time I left a Penske rental with a big box truck marked 12'6" height. Going down the street and checking my gps to get my bearings I looked up just as I entered and underpass to see the sign that said 12'4". All I could do was cringe and hope. No crash. Don't know how much I cleared by but I've been told most signs are low to allow for future repaving.
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Old 02-15-2020, 06:31 PM   #82
Theunz
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I can’t believe we have over 80 posts about simple math. If the bridge is 13’6” and you are less than that you will fit. Not saying that I wouldn’t go slow and hold my breath though�� The only issue here is, are you positive about YOUR height. An accurate measurement of your rig is paramount!
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Old 02-15-2020, 08:28 PM   #83
lightsout
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Originally Posted by Theunz View Post
I can’t believe we have over 80 posts about simple math. If the bridge is 13’6” and you are less than that you will fit. Not saying that I wouldn’t go slow and hold my breath though�� The only issue here is, are you positive about YOUR height. An accurate measurement of your rig is paramount!
Sorry this thread dissapoints you, however I started the discussion in terms of any possible options to lower the height just a bit. Sure sign says 13'6" I am 13'5" at the time of my measurement. I was hoping for some advice how to maybe shave another inch or fraction off. however I think this thread also brought a little more awareness and good discussion (I know I appreciate everyones input). But this is a subject everyone can relate too or will at some point.
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Old 02-16-2020, 10:46 AM   #84
DanandBrenda
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Bridges are measured at the lowest point so if it's arched just move to the center a little or wait until there is no oncoming traffic and drive in the center.
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Old 02-16-2020, 02:00 PM   #85
lightsout
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Bridges are measured at the lowest point so if it's arched just move to the center a little or wait until there is no oncoming traffic and drive in the center.
That is the tricky part of this particular bridge it has an arched Facia however the understructure is the lowest point and lower than the facia arch.

Also keep in mind that many roads are higher in the middle to allow water to drain to the sides so even with an arch does not always suggest that is the highest point.

This seems to be the lesson of this bridge and I assume others.
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