Abstract: An oil containment boom is provided herein. It includes an elongated member of generally V-shaped cross-section, which is provided by a front wall section and a (preferably higher) rear wall section, joined together along respective lower edges. Ballast means are provided for normally maintaining the elongated member upright with the joint between the front and rear walls at the bottom. Float means (preferably inflatable) are provided, which are disposed between the front wall and the rear wall at a predetermined and preselected level above the joint. Drainage means are provided within the front wall to permit polluted liquid which has rolled over the front wall and is trapped in the V-shaped member constituted by the front and rear walls to escape therefrom to an area upstream of the front wall. A novel method of containing oil spills in ice infested water is also provided.