Here is the petition in Dept. of the Interior v. Navajo Nation:

Question presented:

Whether the federal government owes the Navajo Nation an affirmative, judicially enforceable fiduciary duty to assess and address the Navajo Nation’s need for water from particular sources, in the absence of any substantive source of law that expressly establishes such a duty.

Here is the petition and the partial acquiescence by Justice in Arizona v. Navajo Nation:

Questions presented:

I. Does the Ninth Circuit Opinion, allowing the Nation to proceed with a claim to enjoin the Secretary to develop a plan to meet the Nation’s water needs and manage the mainstream of the LBCR so as not to in- terfere with that plan, infringe upon this Court’s re- tained and exclusive jurisdiction over the allocation of water from the LBCR mainstream in Arizona v. California?
II. Can the Nation state a cognizable claim for breach of trust consistent with this Court’s holding in Jicarilla based solely on unquantified implied rights to water under the Winters Doctrine?

Lower court materials here.