Rivers fluctuate in depth. The picture below is of the Mississippi River near the I-270 bridge when it was unusually low.

The sandbar is extensive. But today, the river is at flood stage and the sandbars are deep below the surface. They are still there, although they are being reshaped by the river's current. When exposed again, they will not look like this. Moments include texture and lighting and shapes, and even emotions. A photo captures only the present moment.

I am mesmerized by the river. When the Ohio River flooded and I lived just a few blocks from its banks, I visited the rising water every day. When will it stop? How high will it go? There is no stopping it. People sandbag their homes and businesses to prevent damage, but cannot will the water to recede. The level will eventually fall. The sandbars will be visible again. And we will pretend it won't happen again.