San Juan-Chama Project. The page title and most references use this name; the authorization-history paragraph instead says “San Juan-Cha Project,” an unresolved source-text discrepancy.
United States · Water and environment
In-depth researchRelease 1
Project scope
An inter-basin system conveying water from upper tributaries of the San Juan River toward the Rio Grande Basin. The described collection system includes diversion dams, feeder conduits, siphons and tunnels, with imported water flowing down Azotea and Willow Creeks to Heron Reservoir. The project description also includes Heron Dam and Reservoir, the Pojoaque Tributary Unit with Nambe Falls Dam and Reservoir, and enlargement of the existing El Vado Dam outlet works to pass Heron releases. The source gives conflicting Oso Tunnel capacities: 650 cubic feet per second in the collection-system description and 550 cubic feet per second in its overview table; it does not resolve the discrepancy.
Reported status and procurement
Reported development
The page reports an average annual diversion of about 89,800 acre-feet to the Rio Grande Basin for 1991–2020 and describes Heron Reservoir as operated by Reclamation. The undated operation statement does not establish present-day construction or a current works program.
Procurement availability
Unknown / not established
A source report alone does not establish current progress or an open buying window.
Project summary
The San Juan-Chama Project is described as a transmountain water-diversion system moving water from upper tributaries of the San Juan River toward the Rio Grande Basin. Its listed works include diversion structures, conduits, siphons and tunnels, with imported water reaching Heron Reservoir. The page places the project in Colorado and New Mexico, in the Upper Colorado Basin Region. It reports an average annual diversion of about 89,800 acre-feet to the Rio Grande Basin for 1991–2020 and describes Heron Reservoir as operated by Reclamation; this does not establish a current works program. The page also reports fish-and-wildlife bypass requirements and recurring mechanical sediment removal at the diversion dams.
Evidence limits and unknowns
The supplied page does not establish a current construction or upgrade program, current procurement package, budget, investment amount, or next milestone; its construction history describes historical awards and completions.
The page gives Oso Tunnel capacities of 650 cubic feet per second in the collection-system description and 550 cubic feet per second in its overview table; it does not reconcile them.
The page does not date its statement that Heron Reservoir is operated by Reclamation.
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Project metadata
Country
United States Based on reviewed release evidence
Region
North America
Category
Water and environment Derived from released evidence
Physical assets
Not classified
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
San Juan-Chama Project. The page title and most references use this name; the authorization-history paragraph instead says “San Juan-Cha Project,” an unresolved source-text discrepancy.
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-02
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-02
An inter-basin system conveying water from upper tributaries of the San Juan River toward the Rio Grande Basin. The described collection system includes diversion dams, feeder conduits, siphons and tunnels, with imported water flowing down Azotea and Willow Creeks to Heron Reservoir. The project description also includes Heron Dam and Reservoir, the Pojoaque Tributary Unit with Nambe Falls Dam and Reservoir, and enlargement of the existing El Vado Dam outlet works to pass Heron releases. The source gives conflicting Oso Tunnel capacities: 650 cubic feet per second in the collection-system description and 550 cubic feet per second in its overview table; it does not resolve the discrepancy.
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-02
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-02
The project is authorized to provide incidental recreation and fish-and-wildlife benefits. Each diversion dam has a minimum fish-and-wildlife bypass requirement before diversion, and the page reports recurring mechanical removal of significant sediment buildup at each diversion dam.
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-02
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-02
The page reports an average annual diversion of about 89,800 acre-feet to the Rio Grande Basin for 1991–2020 and describes Heron Reservoir as operated by Reclamation. The undated operation statement does not establish present-day construction or a current works program.
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-02
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-02
The page identifies Colorado and New Mexico, the Upper Colorado Basin Region, source waters in the San Juan River Basin, and conveyance to the Rio Grande Basin. It does not give a more precise location for the whole project.
Attributed to US Bureau of Reclamation own-government project narrative.
Source: US Bureau of Reclamation screened government project narrative · publication date not recorded · observed 2026-10-02
Sources and evidence · US Bureau of Reclamation screened government project narrative
Source published: Not recordedObserved: 2026-10-02
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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