Leveling to tide staff and water's edge at extreme low tide.Bubbler gauge orifice at right lower edge of photo.Improper installation necessitated leveling to assure observing lowest low water. Tidal bench mark leveling work off of DAVIDSON
3/20/2019 1:53:45 PM
Date: 1979
Credit: Lieutenant Linda Mezger, NOAA Corps
Location: Southeast Alaska
Subject: Charting
Subject: Tides
Subject: Leveling