All ya need is 6 lengths of portable electro fencing, 1J energizer, 3 5gal buckets. Move them every 2 days, which everyone should be doing regardless of how many head they have. I read about a guy in Canada who packs 1 million pounds of cattle in a paddock. He moves his every 12hours.
Me, I moved mine today. I will move them again Sunday.
Does the creek transit from your property to someone else, downstream? If so, livestock should never be allowed to drink from there. They can, and will, crap in the area around the creek. That is how disease spread downstream. After hurricane Maria hit Puerto Rico, there were reports of people getting sick as those upstream would . . . crap, in the rivers. My town has a by-law stating no livestock within 300ft of any body of water that transits from one property to another. Hence the 5gal buckets.
I do the same with the goats and the hogs.
The livestock stay out in the fields from early May till early November. Cows, bison, deer, goats, etc. have existed in the wild long before they were domesticated by humans without the need of shelter.
They come into the barn in the winter only because there is no food or water for them out in the fields.
Homesteading/farming is a 24/7 job. Unless I can find friends to cover down and care for the livestock and dogs, I do not leave. That is just a lifestyle I have accepted as a prepper.
Dang glad for it too.