Project Workplans and Scope

The risk assessment described in this Work Plan generally follows the process established in the National Academies’ Special Report 293: Risk of Vessel Accidents and Spills in the Aleutian Islands-Designing a Comprehensive Risk Assessment.  Click here for an electronic copy of the report (Special Report 293).  In August 2013, the Management Team approved a refined work plan (Updated Work Plan) for the remainder of the project.

The risk assessment for maritime operations in Cook Inlet specifically addresses the risk of spills from marine vessels transiting through, near and/or servicing the region.

Types and Sizes of Vessels

All marine vessels of more than 300 gross tons (GT) carrying oil and hazardous substances and all smaller vessels having a fuel capacity of at least 10,000 gallons will be considered.

Accident Types

The risk assessment and proposed risk reduction measures will focus on spills from a variety of accidents. Major accident categories to beconsidered are collisions, allisions, powered groundings, drift groundings, foundering, structuralmap of geographic regionfailures, mooring failures, and fires and explosions. The risk assessment excludes operational and intentional discharges from ships.

Geographic Region

Vessel traffic operating in the Cook Inlet Region as defined in 18 AAC 75.495(3).See map on the right and click on it to view a larger image.


The study time period is 10 years, from 2010 to 2020. 2010 will be used as the base year, where actual vessel traffic will be determined. The subsequent nine years will consist of projections of the base years.


Cook Inlet Aerial photo

Cook Inlet photo2


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