I have moved here over a decade ago, and went through the learning process as you are now. I found that good waterfowl hunting is possible on the right days, at the right spots. Not the huge numbers of geese I was used to, but there are more geese toward Wheatland and then east of there toward Torrington, Lingle etc. That makes for a very early morning if you leave from Casper.I used to do it. Knocking on doors may get you some permission too. I did have some permission years ago near Wheatland, but it is just too far for me. There are some good guides over there for pit/field hunting too.
I have had some really outstanding days for ducks on the public land on the river near Casper. Always on nasty days, and always late in the season. We can get a lot of widgeons, some pintails and tons of golden eye, along with mallards.
I have been hunting quite a bit this season, on the river near Lusby. I lease a blind over there . I have only been getting one or two ducks per trip. I thought the recent snow and cold would have brought more ducks;
I have seen a few more mallards, but really not any great numbers. I hope it gets better soon. There may be better numbers up toward Grey reef, I don't know, cause I'm sticking at my blind.
You can feel free to PM, me. I am no expert, by any means, but may be able to offer some suggestions.