I would like to do a backpacking trip starting at the upper yosemite falls trail but I don't see it on the trailhead capacity report does this mean I can assume there is space for at least 1 person any day?
I think that's the case. They only list dates on which there are NO permits available for any given trailhead. So, if there are permits available every day...
Assuming you're calling the reservation line anyway, you can double check that it's not some glitch.