Oak Island Seaplane Base

3179 Oak Island, Oak Island, MN 56741
General Aviation Airport Fact Sheet 
Oak Island Seaplane Base (4MN2)
Regular Office Hours 
7 days per week, 24 hours per day 
Central Time (CT)  
 
 
  
 
 
 
 
Contact Information 
(218) 386-2796   CBP Warroad Port of Entry
Hours of Service for Entrance 
and Clearance 
Inspection services for the entrance/
arrival of seaplanes only at Oak Island 
Seaplane Base are available 7 days 
per week, 0800-2300 CT in 
accordance with the port's permission 
to land procedures.  
Commercial aircraft operators 
departing the U.S. must obtain an 
outbound clearance by contacting 
CBP directly. 
Permission to Land Procedures 
Pilots must secure permission to land by contacting 
CBP in Warroad, MN prior to departure from the foreign 
port or place and at least 2 hours in advance of the 
anticipated arrival time at Oak Island Seaplane Base.
Permission to land is granted with a tolerance of 
(+/-) 30 minutes.  If your ETA deviates outside 
those parameters, Previously granted permission(s) 
are invalid and you must contact CBP to re-secure 
permission to land. 
Inspection Process 
• An electronic APIS manifest must be filed for all private and commercial aircraft arrivals and
departures in accordance with current regulations and procedures.
• Seaplane operators must land at Oak Island and utilize the CBP ROAM application to complete
arrival processes.
• The ROAM application is authorized for seaplane operator use only at limited locations.  The
use of ROAM for other private and commercial general aviation aircraft is not authorized.
Special Procedures/Miscellaneous 
• Only seaplanes are processed at this location.
• Seaplanes must land on the water, remain on the water, and not drive onto land.
NOTE: For further detailed information regarding national GA processing standards and procedures, 
please refer to the CBP Private Aircraft Arrival Information Document or contact GAsupport@cbp.dhs.gov 
March 25, 2025 Publication Number 4MN2-0325 
Oak Island Seaplane Base