Abstract: The present invention provides a portable outrigger assembly particularly useful on a canoe. The assembly comprises a pontoon and a supporting structure consisting of first and second set of supports for the pontoon. The first set of supports includes adjustable clamping assemblies for clamping to both sides of the canoe with the first set of supports extending generally horizontally outwardly from one side only of the canoe. The second set of supports extend downwardly from the first set of supports to the pontoon with the entire assembly being both adjustable in setting for various different sizes of canoes and also being readily collapsed without requiring the use of tools and without affecting transportability of the canoe.