TOPIC
Colorado River Water & Yuma
What federal Colorado River reductions mean for Yuma-area water holders, with evidence on priorities, planning, conservation and unresolved delivery decisions.
Detailed overview
What the evidence establishes
The 2027–2028 guidelines set a 1.25-million-acre-foot annual Lower Basin reduction. Arizona’s proposed 760,000-acre-foot share is tied to implementing agreements. Yuma-area users have different Priority 1, Priority 3 and Priority 4 entries; statewide arithmetic does not allocate a uniform local cut. 2027–2028 operating guidelines · Reclamation Priority 1 list · Reclamation Priority 3 list · Reclamation Priority 4 list
What this does not establish
The records do not show that Yuma is exempt, loses nothing, loses 27%, or that CAP absorbs the entire Arizona cut. The August on-river Priority 4 scenario was TBD. City legal authorization is not proof of a lawsuit. Arizona shortage presentation · City of Yuma MC 2026-173
What to watch
Execution of implementing agreements; final on-river Priority 4 treatment; individual 2027 orders; new voluntary-conservation agreements; later litigation and reservoir decisions. Last reviewed September 22, 2026. Start with the flagship explainer, then explore the connected claims and sources for the underlying evidence, context, and limitations.
Related claims 16
- VerifiedA listed entitlement, an approved annual diversion, a forecast diversion and forecast consumptive use describe different quantities.
A listed entitlement, an approved annual diversion, a forecast diversion and forecast consumptive use describe different quantities.
- Mostly SupportedArizona’s approximately 27% statewide calculation does not establish an across-the-board 27% cut to Yuma.
Arizona’s approximately 27% statewide calculation does not establish an across-the-board 27% cut to Yuma.
- VerifiedArizona’s August 24, 2026 preliminary planning presentation left on-river Priority 4 shortages TBD.
Arizona’s August 24, 2026 preliminary planning presentation left on-river Priority 4 shortages TBD.
- VerifiedMinute 334 establishes U.S.–Mexico Colorado River cooperative measures through December 31, 2028.
Minute 334 establishes U.S.–Mexico Colorado River cooperative measures through December 31, 2028.
- VerifiedOn September 16, 2026, Yuma authorized potential legal action concerning the federal Colorado River decision.
On September 16, 2026, Yuma authorized potential legal action concerning the federal Colorado River decision.
- VerifiedReclamation describes the Yuma Project as 68,091 acres spanning Arizona and California.
Reclamation describes the Yuma Project as 68,091 acres spanning Arizona and California.
View 10 more related claims
- VerifiedReclamation lists the City of Somerton with a 750-acre-foot annual Priority 4 diversion entitlement.
Reclamation lists the City of Somerton with a 750-acre-foot annual Priority 4 diversion entitlement.
- VerifiedReclamation lists Wellton-Mohawk with 278,000 acre-feet annually of Priority 3 consumptive use.
Reclamation lists Wellton-Mohawk with 278,000 acre-feet annually of Priority 3 consumptive use.
- VerifiedReclamation lists Yuma County Water Users’ Association under both Priority 1 and Priority 3.
Reclamation lists Yuma County Water Users’ Association under both Priority 1 and Priority 3.
- VerifiedReclamation’s lists include both Priority 1 and Priority 4 Cocopah entries.
Reclamation’s lists include both Priority 1 and Priority 4 Cocopah entries.
- VerifiedReclamation’s Yuma Auxiliary Project (Unit B) entries include Priority 1 and Priority 3 rights.
Reclamation’s Yuma Auxiliary Project (Unit B) entries include Priority 1 and Priority 3 rights.
- VerifiedThe Arizona 760,000-acre-foot share is conditional on the required implementing agreements.
The Arizona 760,000-acre-foot share is conditional on the required implementing agreements.
- VerifiedThe City of Yuma’s listed water entitlement combines Priority 1 and Priority 3, totaling 50,000 acre-feet annually of consumptive use.
The City of Yuma’s listed water entitlement combines Priority 1 and Priority 3, totaling 50,000 acre-feet annually of consumptive use.
- VerifiedThe federal 2027–2028 guidelines set an annual Lower Basin reduction of 1.25 million acre-feet.
The federal 2027–2028 guidelines set an annual Lower Basin reduction of 1.25 million acre-feet.
- VerifiedThe guidelines specify 700,000 acre-feet of additional voluntary conservation in total across 2026–2028.
The guidelines specify 700,000 acre-feet of additional voluntary conservation in total across 2026–2028.
- VerifiedThe listed Yuma Mesa Division Priority 3 consumptive-use entitlement totals 250,000 acre-feet across three districts.
The listed Yuma Mesa Division Priority 3 consumptive-use entitlement totals 250,000 acre-feet across three districts.
Sources 20
- Primary source · Government recordADWR: Arizona Reconsultation Committee meeting index
Checked September 22, 2026: newest meeting listed is August 24, 2026. This bounded check does not prove no newer treatment exists elsewhere.
- Primary source · Meeting recordADWR/CAWCD, August 24 Arizona Reconsultation Committee presentation
Slides 22–23 and 39–40. This presentation reflects preliminary government planning and legal positions. Its shortage figures are illustrative and should not be treated as final individual allocations.
- Primary source · Meeting recordCity of Yuma, MC 2026-173, legislation details and report
Status, final-action date, motion scope, staff report, and administrative review dates. Rechecked September 22, 2026: Passed, final action September 16. City legal arguments are attributed advocacy, not judicial findings. The separate Queen Creek transfer dispute is not this motion.
- Primary source · Meeting recordCity of Yuma, September 16 meeting details
Agenda listing; final minutes and action detail unavailable in this view when reviewed.
- Primary source · Public statementDepartment of the Interior, August 21 operating-decision announcement
Supports the announcement date, aggregate reduction and conditional state allocation. The announcement should be read together with the final operating guidelines, which provide the operative details for the conservation period.
- Primary source · Government recordIBWC, Minutes archive
Minute 334 entry: signing and both government approval dates.
View 14 more sources
- Primary source · Government recordIBWC, official Minute 334
PDF p. 1: signing date and term. This is a scanned official document. The cited provision was verified visually in the official copy.
- Primary source · Government recordLower Division States, May 1 proposal, hosted by ADWR
p. 1 term and state shares; p. 4 conservation and funding; p. 7 reservations. A proposal, not proof of executed implementing agreements.
- Primary source · Government recordReclamation, Arizona 2026 schedules, revisions, and approvals
Index located; individual approval records were not comprehensively audited.
- Primary source · Government recordReclamation, Arizona Priority 1 list
Retained September 22, 2026; heading September 2025. Pages 1–3 visually checked against text from the same file. The entitlement list distinguishes diversion quantities from consumptive-use quantities and includes limiting PPR footnotes. Those quantities should not be combined as though they measure the same thing. Not a certification against all later amendments.
- Primary source · Government recordReclamation, Arizona Priority 3 list
Retained September 22, 2026; heading August 2024. Pages 1 and 3 visually checked against text from the same file. District shares total 250,000 AF CU; Unit B is acreage-based; City total is 50,000 AF CU including its PPR component.
- Primary source · Government recordReclamation, Arizona Priority 4 list
Retained September 22, 2026; heading December 2025. Text and rendered pages agree: Somerton 750 AF diversion on page 3; Cocopah 2,026 AF diversion on page 4, with PPR cross-references. The retained official PDF was checked visually against its extracted text for these entries. Later amendments remain outside the scope of this snapshot.
- Primary source · Government recordReclamation, Arizona priority description
p. 1 priority classes and qualifications.
- Primary source · Government recordReclamation, Colorado River entitlement index
Entry point for Arizona priority and entitlement records.
- Primary source · Government recordReclamation, current-link CY2026 forecast PDF
Official current-link PDF retained September 22, 2026. Report stamp: September 21, 2026, 11:44:47 AM (timezone not stated). Same-file text and rendered Arizona pages 2–3 agree. CY2026 City of Yuma approved diversion 32,600 AF; forecast diversion 31,242 AF; forecast use 18,646 AF. Use-to-date is updated through July for monthly reporters and estimated for annual reporters; forecast is provisional, not final actual use or a 2027 order. The URL can change.
- Primary source · Government recordReclamation, final 2027–2028 operating guidelines
§3 printed p. 2; §5.3.A printed p. 7/PDF p. 8; §5.3.B printed p. 8/PDF p. 9; §5.9 printed p. 15.
- Primary source · Government recordReclamation, final Record of Decision
Opening decision-framework discussion. Official decision index: https://www.usbr.gov/ColoradoRiverBasin/post2026/
- Primary source · Government recordReclamation, official water-accounting index
This Source uses Reclamation's official water-accounting forecast link. The forecast is a dated operational snapshot and may be revised as newer accounting data becomes available. The linked forecast was retained September 22, 2026, with a report stamp of September 21, 2026, 11:44:47 AM (timezone not stated). It is provisional, not final actual use or a 2027 order; the current-link PDF may change.
- Primary source · Public statementReclamation, September 9 U.S.–Mexico agreement announcement
Additional official announcement and bundled material: https://www.ibwc.gov/wp-content/uploads/2026/09/US-and-Mexico-announce-Colorado-River-cooperative-agreement.pdf
- Primary source · Government recordReclamation, Yuma Project
General section: acreage and state/division breakdown.
Timeline events 6
- Lower Division States date their short-term operations proposal
The proposal dated May 1 describes a 2026–2028 implementation term, proposed state shares and conservation contingent on funding. This is the document date, not a verified website publication time or executed agreement.
- Interior issues Colorado River decision framework and 2027–2028 guidelines
Interior announces the federal decision, including an annual 1.25-million-acre-foot Lower Basin reduction for 2027 and 2028. The state split remains tied to implementing agreements. The broader decision framework covers 2027–2036.
- Arizona presents preliminary 2027 shortage analysis
The Arizona Reconsultation Committee presentation gives illustrative CAP shortage percentages and leaves on-river Priority 4 TBD. It is planning material, not final user delivery orders.
- United States and Mexico sign Minute 334
Minute 334 is signed in El Paso, Texas. It addresses Colorado River cooperative measures through December 31, 2028, separately from the Lower Basin state-sharing arrangement.
- Both governments approve Minute 334
The IBWC archive records approval by the United States and Mexican governments on September 8, 2026. Approval follows the September 2 signing.
- Yuma authorizes potential Colorado River legal action
MC 2026-173 is marked Passed on September 16. It authorizes the City Attorney’s Office to explore legal action, retain counsel and potentially enter litigation. It does not establish a filed City lawsuit.
Related articles 1
- ExplainerArizona Is Losing Colorado River Water. Is Yuma?
Arizona’s conditional 760,000-acre-foot share does not establish a uniform 27% cut to Yuma. Here is what the official records say about local priorities, planning and the decisions still unresolved.
Organizations 13
- Arizona Department of Water Resources
Arizona agency co-convening the Arizona Reconsultation Committee and hosting its planning records.
- Bureau of Reclamation
Federal agency publishing Colorado River operating guidelines, entitlement lists, project descriptions and water-accounting records.
- Central Arizona Water Conservation District (CAP)
CAWCD operates the Central Arizona Project. This record covers the district and its CAP operating identity, not all Arizona water users.
- City of Somerton
Municipality listed with a 750-acre-foot annual Priority 4 diversion entitlement.
- Cocopah Indian Tribe
Tribal government associated with the Cocopah reservation and United States/Cocopah entries in Reclamation’s entitlement lists. These entries are not a complete inventory of all tribal water holdings.
- International Boundary and Water Commission
Binational commission whose Minute 334 records Colorado River cooperative measures through December 31, 2028.
View 7 more organizations
- North Gila Valley Irrigation District
District with a listed Priority 1 entry and a share of the Yuma Mesa Division Priority 3 consumptive-use entitlement.
- U.S. Department of the Interior
Federal department issuing the August 21, 2026 Colorado River operating decision.
- Unit B Irrigation and Drainage District
District named in Reclamation’s Arizona water-accounting and approval records. Associated entitlement entries are titled Yuma Auxiliary Project (Unit B); the district and federal project are not asserted to be the same legal entity.
- Wellton-Mohawk Irrigation and Drainage District
Irrigation district listed with a 278,000-acre-foot Priority 3 consumptive-use entitlement.
- Yuma County Water Users’ Association
Water users association identified in Reclamation’s Priority 1 and Priority 3 entitlement lists.
- Yuma Irrigation District
District listed with a share of the Yuma Mesa Division Priority 3 consumptive-use entitlement.
- Yuma Mesa Irrigation and Drainage District
District listed with a share of the Yuma Mesa Division Priority 3 consumptive-use entitlement.
Source documents 1
- CY2026 water-use forecast: September 21, 2026 snapshot
Exact official PDF retained September 22, 2026. Official current-link PDF retained September 22, 2026. Report stamp: September 21, 2026, 11:44:47 AM (timezone not stated). Same-file text and rendered Arizona pages 2–3 agree. CY2026 City of Yuma approved diversion 32,600 AF; forecast diversion 31,242 AF; forecast use 18,646 AF. Use-to-date is updated through July for monthly reporters and estimated for annual reporters; forecast is provisional, not final actual use or a 2027 order. The URL can change.