Lumber is quite unstable in those dimensions. You will be better
served to look into man made materials like plywood or MDF, though
they are rare at 10 feet.
It is possible to cut and glue up multiple pieces of lumber to
make the 16" by 10'.
What are you trying to accomplish? Perhaps others here can offer
Keep the whole world singing . . . .
Check in the small ad section of magazines like Woodshop News. There
are a number of places advertising very wide lumber. Be prepared for
sticker shock. As others have said, only go this route if you have a
very good reason to use a single wide board.
One thing you did no say is where you live. The very important item is what
thickness are you talking about. If you live in a timber region of the US,
there are bound to be small local sawmills that can cut it for you. We
have one just up the road that can even provide it kiln dried.
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