My husband and I live in Southeastern Oklahoma, and our year of the snakes was last year. We found and got rid of six breeding pairs of chicken snakes last year. I believe we were lucky enough to get them before they were able to breed. I have found out a lot about these critters since.
1. They produce a musk, so snake-away products and moth balls won't help.
2. They can be active in the day, but mainly at dawn, dusk, and night. Mine seemed to like about 300 AM.
3. Light startles them at night and they tend to freeze in place, but don't take the light off of them or they will disappear in no time.
4. Traps work on them. (See below)
5. They tend to travel in breeding pairs. They lay a musk trail behind them so mates are able to follow. If you dispose of one. Drag it somewhere handy and then dispose of what ever slithers up beside it.
6. They can and will lay dozens of eggs on your place if they like it, and you will have to deal with their offspring the following years.
7. If you see them at a certain time, they will be back the same time next day or at least the next.
Trap number one: Attach a strong string to a small perch hook and insert into an egg. make sure to seal off the hole with piece of tape. This works about 50% of the time. I set six of these last year and caught three snakes. Be sure to tie the string off to a sturdy attachment of some kind.
Trap number 2: Build a wooden box. No matter what size. Make sure there is a hole on both ends and a divider in the middle with a hole. Put one egg in each compartment. you have to check this one often and it only works about a quarter of the time. Here are the dimensions I used. 10"x10"x16" Outside and split it inside into 8" halves.
The geese seem to be doing you a pretty good job. If you can stand the sound of a guinea. 8 to 10 of them will alert you to anything that is off in the area.
Just wondering why you are having so many snakes. Have you had an explosion of mice or other pray in your area, or a lack of predators? Chicken hawks and so on?