I have not seen the roosting areas but suspect they are roosting in several different places during the year out in our pastures. We have several ponds in the area which would be good resources for the crows. When I see a group of crows I am very pleases as I believe they are really cool birds!
We usually see a flock of robins in the spring who spend about one week with us and move on. This summer we have had killdeers nesting in the yard of our farm home which is in the middle of two wheat fields and back by grassed area. A group of Barn Swallows have nested at least twice on the house this summer. Have also had two hatchings of Eastern Bluebirds in yard.
We have seen flocks of 6 to 12 in late spring and last of September for several years. They play around in our yard and in the wheat fields that are planted to wheat. They seem to be making a twice a year visit.