Here are the updated materials in Ak-Chin Indian Community v. Maricopa-Stanfield Irrigation & Drainage District (D. Ariz.):
56 US Motion to Dismiss Counterclaims
65 Irrigation Districts Response to 56
73-1 Ak-Chin Motion to Dismiss Counterclaims
81 Irrigation Districts Response to 73
86 Ak-Chin Reply in Support of 73
Prior post here.