HARBOR SYSTEM MASTER PLAN - City and Borough of Sitka

SEAPLANE FLOAT
The seaplane float was originally designed by the State of Alaska, Department of Transportation in 1962.
Access to the seaplane float is provided by a 6-ft x 150-ft long timber approach trestle that intersects with
Katlian Street. The approach trestle supports a 6-ft x 50-ft long steel gangway that lands on a 10-ft wide x
110-ft long main float. The main float provides transient moorage for approximately three seaplanes.
Perpendicular to the main float is a 10-ft wide x 200-ft long float that provides moorage landings for up to
eight seaplanes.
Observations
Approach Dock:
The timber approach dock is weathered and at 50 years old and has exceeded its life expectancy.
Gangway:
The gangway is of lightweight construction and its length is short, however its components are in fair
condition. The primary concern regarding the gangway is its length. 50-ft gangways are no longer permitted
in new construction due to the steep gradient that is created during low tides. 80-ft minimum length
gangways are required to meet current American Disabilities Act (ADA) standards.
Floats:
In general the timber floats are weathered and shows signs of age. There is no remaining preservative
treatment visible on the timbers. The float freeboard is approximately 8-in. The galvanized coatings of the
steel pipe piles above the tidal level are beginning to disappear and surface rust on the piles was observed.
Conclusions
Sitka Harbor System Master Plan
Condition Inventory
In general, the current overall condition of the seaplane float is fair to poor. The facility shows signs of age
and is nearing the end of its useful design life. The seaplane float has an estimated remaining safe and usable
service life of approximately 5 years.
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