delivered the opinion of the Court.
*597
This is a suit to determine conflicting claims to underground waters collected and brought to the surface by a mining tunnel in Utah. The plaintiff (petitioner here) is a mining company incorporated in Delaware and the defendant an irrigation company incorporated in Utah. Each seeks to have the right to use the waters quieted in itself as against the other. The District Court, with some hesitation, gave a decree for the mining company, which the Circuit Court of Appeals reversed with a direction that one for the irrigation company be given.
• The mining company owns and operates a mine in a mountain along a tributary of the Provo River and, in furtherance of its mining operations, has driven a tunnel 14,500 feet into the mountain from a portal near the stream. The tunnel intercepts and collects waters percolating through the bosom of the mountain and conveys them to the portal, whence they now flow into the stream. The tunnel was begun in 1910 and these waters are intercepted and collected along its course after it -gets well into the mountain. Thé mining company owns a tract of land surrounding the portal and we assume it has a right of way for the tunnel beyond that tract, although this does not appear. It has. not used and does .not now use any.of the waters in connection with its tunnel or mine, but asserts an exclusive right to them and has arranged, and'is intending, to sell to others the right-to use them for irrigating distant' lands.
. The irrigation company is a corporate agency of a community of farmers and holds, controls and administers for their mutual advantage the water rights which enable them to irrigate and cultivate their lands, al1 of which are naturally arid. Long prior to the driving of the tunnel, and' while the -lands through which it extends were *598 public lands of the United States, the irrigation company or its stockholders appropriated all the waters of the stream for irrigation and other beneficial uses; and under that appropriation these waters long have' been applied and devoted to such uses on the lands of. the stockholders some distance down stream from the portal of the tunnel.
The waters intercepted and collected by the tunnel are percolating waters which before it was driven found their way naturally,—but not in a defined channel,—through the rocks, gravel and soil of the mountain into open springs near the stream and thence by surface channels into the stream. At all seasons this was one of the stream’s sources of supply, and in the late summer and early fall one of its mostdependable sources. The amount of water so naturally finding its way underground into the springs and thence into the stream has been materially diminished by the tunnel,—the diminution conforming substantially to the discharge at the portal. All the natural flow of the stream as it was before the tunnel was driven is required to satisfy the prior appropriation of the irrigation company or its stockholders and to irrigate the lands of the latter, to which it long has been applied; and, unless the waters so intercepted and collected by the tunnel be permitted to flow from its portal into the stream in such way that they can be used under the prior appropriation, a material part of the lands heretofore reclaimed and irrigated thereunder will be without water and their cultivation must be discontinued.
Several questions were presented to and decided by the Circuit Court of. Appeals, but only one merits discussion here. It is whether under the law of Utah the waters which the tunnel intercepts, collects and conveys to its portal belong to the mining company or are within the appropriation made by the irrigation company or its *599 stockholders before the. lands through which the tunnel extends became private lands.
The parties, while agreeing that the Utah law is controlling, differ as to what that law is. On the part of the mining company it is contended that when the tunnel site was acquired and the tunnel driven, Utah had adopted and was applying the common-law rule respecting underground waters; that by that rule such waters, where not moving in a known and defined channel, are part of the land in which they are found and belong absolutely to its owner; and that, if the law of Utah in this regard has since been changed, rights vested before the change are not affected by it. On the part of the irrigation company it is insisted that the common-law rule never was adopted or in force in Utah; that her law always has regarded waters percolating underground, where within the public lands, as open to appropriation for irrigation or other beneficial uses, subject only to a reasonable use of them in connection with the land in which they exist by whoever may come to own it, and that her law likewise has regarded an appropriation of the natural flow of a surface stream as reaching and including its underground sources of supply within the public lands, subject only to the qualification just indicated.
Both courts below experienced some embarrassment in solving this question of Utah law,—the District Court observing that the Supreme Court of the State, although having-the question before it a number of times, “ has never definitely announced its adherence ” to either view, and the Circuit Court of Appeals that the early decisions, although “ not always harmonious,” “ seem to have favored the English rule,” while the later decisions have given effect to the other view. That there was some basis for the embarrassment is plain. Particularly was .this true when the District- Court made its ruliner. Thereafter, and before the ruling by the Circuit Court of Appeals, the *600 situation was partly clarified by two decisions in the state court, 1 and it now has been further clarified by two still later decisions in that, court. 2
Utah is within the semi-arid region of the West, where irrigation has been practiced from the time "of the earliest settlements and is indispensable to the cultivation of the lands. She was made a Territory in 1850 and became a-State January 4, 1896. While she was a Territory and most of the lands within her borders were part of the public domain, Congress passed three acts which require notice.
The Act of July 26, 1866, c. 262, 14 Stat. 251, provided, in its ninth section: “Whenever, by priority of possession, rights to the use of water for mining, agricultural, manufacturing, or other purposes, have vested and accrued, and the same are recognized and acknowledged by the local customs, laws, and the decisions of courts, the possessors and owners of such vested rights shall be maintained and protected in the same.” The Act of July 9, 1870, c. 235, 16 Stat. 217, declared, in its seventeenth section, that “ all patents granted, or pre-emption or homesteads allowed, shall be subject to any vested and accrued water rights ” recognized by the provision of 1866. And the Act of March 3, 1877, c. 107, 19 Stat. 377, after providing for the sale of desert lands in small tracts to persons effecting the reclamation thereof by an actual appropriation and use of water, declared that “ all surplus water over and above such actual appropriation and use, together with the water of all lakes, rivers and other sources of water supply upon the public lands and not navigable, shall remain and be held free for the appropriation and use of the public for irrigation, mining and manufacturing *601 purposes subject to existing rights.” This .Court has said of these enactments that “ the obvious purpose of Congress was to give its assent, so far as the public lands were concerned, to any system, although in contravention of the common law rule, which permitted the appropriation of the waters for legitimate industries.”
By an Act of February 20,1880, the legislative assembly of the Territory declared (Laws 1880, c. 20, § 6): “A fight to the use of water for any useful purpose, such as . . . irrigating lands, ... is hereby. recognized and acknowledged to have vested and accrued, as a primary right, . . . under any of the following circumstances: First — Whenever any person or persons shall have taken, diverted and used any of the unappropriated water of any natural stream, water course, lake, or spring, or other natural source of supply. . . .”
It was in'the presence of these enactments, congressional and territorial, and prior to any decision thereon in Utah, that the irrigation company or its stockholders made the appropriation in question.
The first case .in Utah involving rights asserted under an appropriation such as is described in these enactments was
Stowell
v.
Johnson,
The next case was
Sullivan
v.
Northern Spy Mining Co.,
Shortly after the decision in that case came the constitution of the State, which says (Art. 17, § 1): “ All existing rights to the use of any of the waters of this State for any useful or beneficial purpose, are hereby recognized and confirmed.”
The next case to engage the court’s attention was
Crescent Mining Co.
v.
Silver King Mining Co.,
For several years after the ruling in that case the decisions were largely in a state of flux, — the opinions disclosing pronounced differences among the judges and tending at times in favor of'the common-law rule and at other times against it. A notable case of that period was before the court on two successive appeals.
Herriman Irrigation Co.
v.
Butterfield Mining Co.,
*606
The later decisions have all tended in one direction and have resulted in establishing the rule for which the irrigation company contends, and which the Circuit Court' of Appeals applied. These decisions frankly deal with the prior situation as we have described it, reaffirm the principles announced in the early cases of
Stowell
v.
Johnson
and
Sullivan
v.
Northern Spy Mining Co.,
point out the dicta and uncertainty in the opinions delivered in several cases, hold that the common-law rule is not applicable to the conditions in Utah, and show that it never was definitely adopted or followed there.
Mountain Lake Mining Co.
v.
Midway Irrigation Co.,
We conclude, therefore, that the decree of the Circuit Court of Appeals was right.
Decree affirmed.
