Here are some pics.  Sitting on a poured wall.  The loft is about 10 feet from the floor, I would like to be able to get tractors in for sure, so probably 13 minimum and I want an overhead door.  So probably 15 feet to the bracing.  I am guessing the peak to be about 23-24 feet.  Not going to line, this will be only storage.  Thanks for the help and hope you didn't get blown away...
Oops, sorry for the sideways pics...
Edit again - fixed the pics and spelled storage right.  Pic 6 is where the stud meets the loft floor.

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