Abstract: A portable flare stack includes a base having a first end and a second end. A tubular conduit extends substantially the length of the base. The tubular conduit has a flaring end and a gas connection end. The tubular conduit is pivotally mounted at one of the first end and the second end of the base for movement between a travel position and a flaring position in which the tubular conduit extends substantially perpendicular to the chassis. A counterweight is positioned adjacent to the gas connection end of the tubular conduit. A drive mechanism is provided for moving the tubular conduit, as required, between the travel position and the flaring position.