I'm not sure how the creeks are in your area, but here you have gravel bars, clay holes. I always walk up stream so as not to muddy the water, as I go along. It's hard to spot things in moving water but you can do it. I look over rock bars twice before I walk on, I can't tell you how many things I have found on the 2nd look. I also look up the banks, I have found a many a point laying on the side of the bank put there by high water, and you never know when something may be washing out of a bank. Once I found the femur bone to a giant ground sloth, where the bank had caved into the creek, it was 20ft from the water. Where I live the water sometimes will rise in a wash by 15ft with a heavy rain, so it puts artifacts all over. Most of the creeks and wash beds are only 15ft to 25ft across with banks that can be 20 to 60ft tall, makes it tough to go around a log jam. In my area there is hardly a ridge top any where that did not have occupation on it at some time.