From PigBoats.COM

L-7 maneuvering up to a moor at the Mare Island Navy Yard, Vallejo, CA., April 15, 1918. The circular flood ports for the watertight superstructure are very evident here. There are no bow planes because the Lake design for the L-class had midships diving planes.

USN Photo 3905 courtesy of Darryl Baker via Navsource.org.

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