In the Seattle area
Board - also a rough and ready place, no frills -- $4500
grain and supplements - $1000
Two annual vet vists for shots, teeth etc - $600
Farrier - $665

Basic cost, just keeping him alive and healthy -- $6765

Weekly Lessons - $2080
I have a small pickup I only use to drive to the barn, and it costs $120 a month in gas, so that is $1440

Now we are at $10,285.

And that is not counting tack, treats, grooming supplies, shows, or hauling the trailer on various trail rides & etc, or any of the other various things I find to spend money on.