California Code, Public Utilities Code - PUC § 10151

There is granted to every municipal corporation of the State the right of way for the location, construction, and maintenance of water works and works for the generation and distribution of electrical power, and for every necessary adjunct thereto, over any swamp, overflowed, or other public lands of the State not otherwise disposed of or in use, not in any case exceeding in length or width that which is necessary for the construction of the works or adjuncts, or for the protection thereof, and not in any case exceeding 100 feet in width along each side of the marginal limits of the works or adjuncts.