The unit combines structural works and nonstructural measures. Its principal physical works include the Yuma reverse-osmosis desalting plant; a 53-mile concrete-lined bypass drain carrying reject water from the plant via the MODE toward Santa Clara Slough in Mexico; a buried reinforced-concrete siphon replacing a MODE flume section; and associated access, power, water-supply, sewage-treatment, and energy-recovery facilities. Other measures include Wellton-Mohawk irrigation-efficiency improvements and acreage reduction, fish and wildlife mitigation, and a Painted Rock Reservoir land-acquisition and operating-schedule measure. The source describes the sludge-disposal facilities as being in advance planning; Pilot Knob in Imperial County was proposed and under negotiation, while an interim alternative site was also described. The Painted Rock land measure is materially qualified by the source-era account: the Corps said it lacked legal authority to purchase the lands and that purchase would not change its release plan. This does not establish the measure’s present status.
Reported status and procurement
Reported development
Plan: The stated objective is to reduce the quantity and improve the quality of saline Wellton-Mohawk drainage so that more water can be credited toward treaty deliveries. The plan estimates about 97,300 acre-feet of feed water annually, about 68,500 acre-feet of product water and 28,800 acre-feet of reject water, with about 10,100 acre-feet of raw MODE water blended with product water to yield about 78,600 acre-feet annually for return to the Colorado River. The source also describes an intended average salinity 115 parts per million above the salinity of water arriving at Imperial Dam. These are stated objectives and plan estimates, not verified operating results.
Procurement availability
Unknown / not established
A source report alone does not establish current progress or an open buying window.
Project summary
CRBSCP - Desalting Complex Unit - Title I is described as a combination of structural works and nonstructural measures across southwestern Arizona and northwestern Sonora, Mexico. The plant site is about four miles west of Yuma, Arizona. The physical scope includes a reverse-osmosis desalting plant, a concrete-lined bypass drain to Santa Clara Slough, a buried siphon, and associated facilities. The account also describes irrigation-efficiency and acreage-reduction measures and habitat mitigation. Its water-treatment and delivery figures are plan estimates, not verified operating results. The account reports plant construction began in 1980 and says the remaining pretreatment facilities were scheduled for completion in 1984; it does not establish present condition or operation.
Evidence limits and unknowns
The account does not establish the present condition or operating status of the plant and other works; it reports a 1984 schedule for remaining pretreatment facilities without confirming the outcome.
The final sludge-disposal site and implementation status are not established. Pilot Knob is described as proposed and under negotiation, with an interim alternative site also mentioned.
The historical contract award and project plans do not establish a current procurement opportunity or schedule.
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Project metadata
Country
Mexico, United States Based on reviewed release evidence
Region
Latin America Caribbean, North America
Category
Water and environment Derived from released evidence
Physical assets
Desalination
Based on this release's supporting evidence. Unresolved fields remain unclassified; these labels do not establish current progress or a buying window.
Released facts and supporting evidence
Each fact retains its source, uncertainty and time context. If a publisher page moves or is unavailable, use the recorded quotation and observation date below.
Project name
Source reported
CRBSCP - Desalting Complex Unit - Title I
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-03
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-03
The unit combines structural works and nonstructural measures. Its principal physical works include the Yuma reverse-osmosis desalting plant; a 53-mile concrete-lined bypass drain carrying reject water from the plant via the MODE toward Santa Clara Slough in Mexico; a buried reinforced-concrete siphon replacing a MODE flume section; and associated access, power, water-supply, sewage-treatment, and energy-recovery facilities. Other measures include Wellton-Mohawk irrigation-efficiency improvements and acreage reduction, fish and wildlife mitigation, and a Painted Rock Reservoir land-acquisition and operating-schedule measure. The source describes the sludge-disposal facilities as being in advance planning; Pilot Knob in Imperial County was proposed and under negotiation, while an interim alternative site was also described. The Painted Rock land measure is materially qualified by the source-era account: the Corps said it lacked legal authority to purchase the lands and that purchase would not change its release plan. This does not establish the measure’s present status.
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-03
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-03
The source reports a September 1975 contract award for the MODE siphon and relocation of Yuma’s standby municipal pumping plant; the siphon was completed in June 1976. It reports Mexico’s 37-mile drain segment completed in March 1977, the U.S. segment completed in June 1977, and the drain placed in operation on June 23, 1977. The acreage-reduction measures were reported completed in 1978. Plant construction began in 1980; some pretreatment facilities and the switchyard were reported completed, while completion of the remaining pretreatment facilities was scheduled for 1984. The separate Yuma Desalting Test Facility was used for testing and was reported to have stopped testing in June 1982 and since been disassembled. These are historical statements in an undated account, not evidence of present condition or operation.
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-03
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-03
The stated objective is to reduce the quantity and improve the quality of saline Wellton-Mohawk drainage so that more water can be credited toward treaty deliveries. The plan estimates about 97,300 acre-feet of feed water annually, about 68,500 acre-feet of product water and 28,800 acre-feet of reject water, with about 10,100 acre-feet of raw MODE water blended with product water to yield about 78,600 acre-feet annually for return to the Colorado River. The source also describes an intended average salinity 115 parts per million above the salinity of water arriving at Imperial Dam. These are stated objectives and plan estimates, not verified operating results.
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-03
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-03
The unit is described across the lower Gila and Colorado River valleys of southwestern Arizona and northwestern Sonora, Mexico. The plant site is about four miles west of Yuma, Arizona. The drain crosses into Mexico and continues to Santa Clara Slough. Imperial County, California, is mentioned as a proposed—not established final—sludge-disposal location.
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-03
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-03
Prior and superseded states remain labelled. Dates below identify source publication when known, otherwise source observation. They are not assumed event dates; each fact retains its own time qualifications.
No material timeline events have been released.
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