An acquaintance took a houseboat + kayaking tip up the Escalante arm
last fall. I think it was lower then than it is now. They saw features
that had been exposed for the first time since the reservoir was filled.
Delicate Arch maybe? Can't recall.

Sounds like you want to come down the Colorado arm. Snowpack is down
from last month, so perhaps this fall the reservoir will be even lower.
http://www.wrcc.dri.edu/cgi-bin/sno_narr3_pl
Only 57% on the Gunnison, 50% on the San Juan, 70% upper Colorado.