In the first photo, you may be able to see a group of mallards at the back.
As my friend Adele and I looked down at this next bit of the creek on Saturday, it almost looked like a summertime scene where skimming insects leave constant dimples and ripples on the water -- but this was late January, so insects weren't a possibility. We soon realized that there was very fine drizzle, which we hadn't noticed until then, making the drop marks on the water.
This next one is a crop of the photo above. Click the photo to see the larger version showing the many overlapping ripple marks.