Sunday through Thursday is sign in at the Loma ramp. Friday and Saturday night camping you call the BLM office 60 days out from launch date.. People in the BLM office have said that usage is down this year so I'd be suprised if you didn't get what you wanted within that time.As far as shade, Rattlesnake, Bull Draw, Cottonwood, Mee 1, Black Rock 5 has two little cottonwood trees not much, Black Rock 9 has one tree and some stone features that offer some shade, and Island has shade. There may be a few others but these are the ones I know of. Cottonwood is definetly the best with large open spanse of shade through out.
I'm out there for a week probably 4 or 5 times a year as my family LOVES that run.
WINDS: From Mee sites down to Westwater the wind typically blows down river in the mornings but changes around 11 a.m. From the Loma put in to you get down to the railroad tracks (big turn) the winds will blow down river until about 1 p.m. Seems to me that if you launch from Loma at 1 p.m. or shortly after plan on staying at Cottonwood, the two times I'm have bitting the bullet and braved the winds in this flow/level I've been able to make Black Rock but it took me until 7 p.m. or 8 p.m. I would advise to rest up at Cottonwood and get back on the river early 9-10 and make it to Black rock.
(THE ABOVE ADVISE IS NORMAL WEATHER CONDITIONS WITH NO FRONTS COMING IN).
Feel free to PM me with more questions
Once interested side note: Troy the head ranger dude out there told me once that the wind can get so strong out there that he has almost had his raft flipped end over end so he nows weights his boat nose heavy!