They have a seat and pipe frame. Some of the blinds have reeds as camo others are out in the open.
ALL are in water well away from shore.
TIP. Don't drop anything in the blind. There is at least a foot of water under the seat.
Many hunters don't use the blind, but hide in the reeds.
There is a post and you can hunt within 100 foot radius of the post.
The McNary website has an excel spreadsheet showing the best blinds.
Blind 6 is always the first to be chosen.
Although there are 25 reservations per day, only a handful actually show up.
I have seen times when the 25th reservation got the 2nd pick.