Both Union and Horseshoe have drawing areas. I have more experience with Horseshoe, so I'll start there.
There is a drawing area for the fields. I believe there are 30 some odd blinds. I haven't hunted the drawing area in quite a few years but when I did hunt it there were a few birds to kill. The problem, as it was explained to me, was that the tree huggers were fighting the state on tree removal and so the fields weren't like they want them. There were piles of trees that had been cut down all over the place last time I went there, just rotting away. It costs $15 per person with a two person max per blind. The usual rules apply: 1 dozen minimum decoys, 25 shells per person during duck season, 10 during goose season, cased guns to and from blind, etc etc. They drive you out to your blind on trucks and pick ya up at the end. Hunting is from shooting light to 12, out by 1. There are walk-in fields out by the highway and they aren't bad. The Cache will flood up in to them and makes for some decent duck hunting. The only boat access is on the Cache and I've heard plenty of shooting down there when I hunted there, never have hunted the Cache though.
Union has around 30 pits, and used to have two blinds, but I think they've changed that. $15 per person, max of 2 per pit. Same as above: 25 shells during duck season, 10 during goose season, etc etc. There is another area of Union that is geared more towards duck hunting, but I don't know anything about it. I believe that area is the firing line. Union has always had a pretty good set-up. Nice warm pits and usually holds birds. If there is a decent amount of water on your hole they used to supply goose floaters for the hole, don't know if they still do that. They, as does Horseshoe too, rent goose shells for those that wanna give it a try but don't have the decoys.
With 90,000 ducks sitting at Union, I will be there Friday and possibly Saturday, but the permit holders will be in full force Saturday. Good luck and if ya have any other questions ask away.
Vegetarian- Indian word for lousy hunter.