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<br />trust. The court acknowledged that although it could absolutely <br />divest all landowners who held property pursuant to conveyances <br />made under the 1870 act, it could only do so ifit compensated those <br />owners. Berkeley, pages 533-534. <br />The reason it chose this intermediate course is obvious. The <br />lands which had alxeady been developed were valueless for public <br />trust purposes. Conceivably, the court could have taken the extreme <br />position that these lands should be restored so they could be used <br />for trust purposes. However, by choosing the middle ground and <br />balancing the interests involved, the court set a precedent for <br />resolving future trust disputes. <br /> <br />Types of Waters and Uses to Which <br />the Public Trust Doctrine Applies <br />Historically, although apparent that the California public trust <br />doctrine applied to tidelands, navigation, commerce, and fisheries, its <br />application to other waters and other purposes was uncertain. Two <br />cases alleviated much of that uncertainty. In People v. Gold Run Ditch <br />& Mining Co. (1884) 66 Cal. 138, 151-52, the court applied the public <br />trust doctrine to inland waters. In Marks v. Whitney, (1971) 6 Cal.3d <br />251,259-60, the court expanded the scope of the public trust beyond <br />the traditional purposes of navigation, commerce, and fisheries to <br />include environmental and aesthetic purposes. <br />Gold Run Ditch was a very significant case, as much for its social <br />as its legal impact. The case involved hydraulic mining on the <br />American River and was the death knell for the hydraulic mining in- <br />dustry in California. Hydraulic mining involved spraying water at a <br />high velocity from water cannons against a hillside in order to wash <br />down gravel from which gold was recovered, but most of the sand and <br />gravel tailings washed into rivers, in this case the north fork of the <br />American River. These tailings amounted to nearly 5,000 cubic yards <br />of boulders, sand, and gravel each day. Gold Run Ditch, page 144. <br />The impact of the discharge of these tailings had been dramatic. <br />The beds of both the American River and the Sacramento River <br />(below its confluence with the American River) had risen 6 to 12 <br />feet, increasing the possibility of flooding. Navigation was severely <br />impaired, and the water of the American River was no longer fit for <br />domestic consumption. Gold Run Ditch, page 145. Faced with these <br />facts, the court upheld the lower court's injunction of the company's <br />discharge of debris into the river. Gold Run Ditch, page 152. <br />The court was aware that hydraulic mining was not economi- <br />cally feasible if streams could not be used for the discharge of debris. <br /> <br />The courts have now expanded the scope <br />of the public trust beyond the traditional <br />purposes of navigation, commerce, and <br />fisheries to include environmental and <br />aesthetic purposes. <br /> <br />Chapter 3 Consumptive and Environmental Uses 81 <br />