This image shows a much more sturdy looking and better maintained dock than the previous image. Also, this one is much more popular among the California Gull population. A quick review of the population shown indicates these are all adult males.
There is a net drying frame in the left rear of the picture, so this is likely also a fishing dock.
The caption states:
Sea Gulls Northport, Mich. 52
This picture likely dates from the 1930s.