MEMORANDUM

Las Virgenes-Triunfo Joint Powers Authority (“Las Vírgenes”) appeals the denials of its motion to intervene and its non-party motion under Fed. R. Civ. P. 12(h)(3) challenging the district court’s subject-matter jurisdiction. Our jurisdiction is governed by 18 U.S.C. § 1291 , and we dismiss in part and deny in part Las Virgenes’s appeal.

1. We lack jurisdiction to review the denial of Las Virgenes’s motion to intervene. A complete denial of a motion to intervene is a final decision subject to immediate appellate review, “because the applicant [could] not appeal from any subsequent order or judgment in the proceeding.” Stringfellow v. Concerned, Neighbors in Action, 480 U.S. 370, 378 , 107 S.Ct. 1177 , 94 L.Ed.2d 389 (1987) (alteration in original) (internal quotation marks omitted). Failure to timely appeal the denial of a motion to intervene waives the appeal. See United States v. City of Oakland, 958 F.2d 300, 302 (9th Cir. 1992). The district court denied Las Vir-genes’s motion to intervene on March 31, 2014. Las Vírgenes had to file its notice of appeal within sixty days of that denial, see Fed. R. App. P. 4(a)(1)(B), but did not file its notice of appeal until more than a year later. This appeal is therefore untimely.

2. The district court correctly concluded that Las Virgenes’s challenge to its subject-matter jurisdiction to enter and amend the Consent Decree is moot. “[A] case becomes moot when the issues presented are no longer live or the parties lack a legally cognizable interest in the outcome.” Murphy v. Hunt, 455 U.S. 478, 481 , 102 S.Ct. 1181 , 71 L.Ed.2d 353 (1982) (internal quotation marks omitted). EPA has undisputedly met all of its deadlines and fulfilled all of its obligations under the Consent Decree. As such, the Consent Decree has terminated by its own terms. See, e.g., Hallett v. Morgan, 296 F.3d 732, 749 (9th Cir. 2002). Las Virgenes’s argument that the Consent Decree “is the sole basis for legitimizing the EPA’s issuance of the 2013 Malibu Creek TMDL,” and therefore has continuing legal effect, lacks merit. The Consent Decree did not confer—and could not have conferred—on EPA any authority the agency did not otherwise have. It merely established a timetable by which EPA would be required to fulfill its purported preexisting statutory obligations. Because the Consent Decree has terminated and has no prospective legal effect, a challenge to .the subject-matter jurisdiction of the district court to enter and amend it cannot provide “effective relief’ and is thus moot. Pub. Utils. Comm’n of Cal. v. FERC, 100 F.3d 1451 , 1458 (9th Cir. 1996).

3. We decline to treat Las Virgenes’s appeal as a petition for a writ of mandamus. Because Las Vírgenes addressed mandamus for the first time in its reply brief, the request is not properly before us. See Miller v. Fairchild, Indus., Inc., 797 F.2d 727 , 738 (9th Cir., 1986). Moreover, Las Virgenes has not shown that there is any basis under our five-factor test to warrant issuance of the writ. See Bauman v. U.S. Dist. Court, 557 F.2d 650, 654-55 (9th Cir. 1977).

DISMISSED in part; DENIED in part.

This disposition is not appropriate for publication and is not precedent except as provided by Ninth Circuit Rule 36-3.