The state of Colorado, at its own expense, shall establish and maintain two permanent stream- gaging stations upon the La Plata river for the purpose of measuring and recording its flow, which shall be known as the Hesperus station and the Interstate station, respectively.
The Hesperus station shall be located at some convenient place near the village of Hesperus, Colorado. Suitable devices for ascertaining and recording the volume of all diversions from the river above Hesperus station, shall be established and maintained (without expense to the state of New Mexico), and whenever in this compact [this section] reference is made to the flow of the river at Hesperus station, it shall be construed to include the amount of the concurrent diversions above said station.
The Interstate station shall be located at some convenient place within one mile of, and above or below, the interstate line. Suitable devices for ascertaining and recording the volume of water diverted by the Enterprise and Pioneer canals, now serving approximately equal areas in both states, shall be established and maintained (without expense to the state of New Mexico), and whenever in this compact reference is made to the flow of the river at the Interstate station, it shall be construed to include one- half the volume of the concurrent diversions by such canals, and also the volume of any other water which may hereafter be diverted from said river in Colorado for use in New Mexico.
Each of said stations shall be equipped with suitable devices for recording the flow of water in said river at all times between the 15th day of February and the 1st day of December of each year. The state engineers of the signatory states shall make provision for cooperative gaging at the two stations, for the details of the operation, exchange of records and data, and publication of the facts.
The waters of the La Plata river are hereby equitably apportioned between the signatory states, including the citizens thereof, as follows:
- at all times between the 1st day of December and the 15th day of the succeeding February, each state shall have the unrestricted right to the use of all water which may flow within its boundaries;
- by reason of the usual annual rise and fall, the flow of said river between the 15th day of February and the 1st day of December of each year, shall be apportioned between the states in the following manner:
- (a) each state shall have the unrestricted right to use all the waters within its boundaries on each day when the mean daily flow at the Interstate station is one hundred cubic feet per second, or more;
- (b) on all other days the state of Colorado shall deliver at the Interstate station a quantity of water equivalent to one-half of the mean flow at the Hesperus station for the preceding day, but not to exceed one hundred cubic feet per second;
- whenever the flow of the river is so low that in the judgment of the state engineers of the states, the greatest beneficial use of its waters may be secured by distributing all of its waters successively to the lands in each state in alternating periods, in lieu of delivery of water as provided in the second paragraph of this article, the use of the waters may be so rotated between the two states in such manner, for such periods, and to continue for such time as the state engineers may jointly determine;
- the state of New Mexico shall not at any time be entitled to receive nor shall the state of Colorado be required to deliver any water not then necessary for beneficial use in the state of New Mexico;
- a substantial delivery of water under the terms of this article shall be deemed a compliance with its provisions and minor and compensating irregularities in flow or delivery shall be disregarded.
The state engineers of the states by agreements, from time to time, may formulate rules and regulations for carrying out the provisions of this compact, which, when signed and promulgated by them, shall be binding until amended by agreement between them or until terminated by written notice from one to the other.
Whenever any official of either state is designated to perform any duty under this compact [this section], such designation shall be interpreted to include the state official or officials upon whom the duties now performed by such official may hereafter devolve.
The physical and other conditions peculiar to the La Plata river and the territory drained and served thereby constitute the basis for this compact, and neither of the signatory states concedes the establishment of any general principle or precedent by the concluding of this compact.
This compact may be modified or terminated at any time by mutual consent of the signatory states and upon such termination all rights then established hereunder shall continue unimpaired.
This compact shall become operative when approved by the legislature of each of the signatory states and by the congress of the United States. Notice of approval by the legislatures shall be given by the governor of each state to the governor of the other state and the president of the United States is requested to give notice to governors of the signatory states of approval by the congress of the United States.
In witness whereof, the commissioners have signed this compact in duplicate originals, one of which shall be deposited with the secretary of state of each of the signatory states.
Done at the city of Santa Fe, in the state of New Mexico, this twenty-seventh day of November, in the year of our Lord, one thousand nine hundred twenty-two.