Portable gas containers

Each vehicle or vehicle and trailer is allowed no more than two 6-gallon containers of gasoline, subject to the following:

No single container shall exceed a maximum water capacity of 6 gallons;
Gasoline containers must be UL or USCG approved;
Portable containers must be tightly closed, not missing any parts, and stowed in a secure manner to the satisfaction of ferry personnel;
Portable containers must not be transported in the passenger compartment of a motor vehicle;
Each owner or operator of a vehicle must advise ferry personnel of the presence in or on their vehicle of any portable containers of gasoline;
Gasoline containers shall be made available for inspection by ferry personnel, and a visual inspection must be performed before any containers are allowed onboard;
Any container showing deterioration which might affect its integrity will not be allowed onboard the vessel;
Smoking is not allowed onboard the ferry at any time.

CLARIFICATION:
Portable gasoline containers may only be transported in the open bed of a pick-up truck or on an open trailer. Portable gas containers cannot be transported in the trunk of a vehicle and cannot be carried onboard by a walk-on passenger or in a wheelbarrow.

source: http://www.skagitcounty.net/Departments/PublicWorksFerry/main.htm