Lost large red and green plaid picnic blanket with classic check pattern along a riverbank in Eastern Montana.

I lost my favorite plaid picnic blanket while out exploring with my family along the riverbank in Eastern Montana last weekend. It’s quite large, red and green with a classic check pattern, perfect for sitting on during our outdoor lunches. I'm really hoping someone might have found it or seen it around. It has some sentimental value, and I would love to have it back!