Dave Howell, Nellie D. 37VT63
A definition of stress? A strong current pushing your tug into a bridge that you're not sure you can get under.
Here's a simple, inexpensive solution: a landscaper's level (see photo below). With the mast down the highest object on Nellie D. is the wheelhouse mounted radome. So, positioning the level at the radome's height and then looking at the bridge through the level tells us all we needed to know. If the level's reticle is below the height of the lowest steel there's clearance. If not, it's probably best to wait for the bridge to open.
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