The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Sites Authority’s October 8, 2026 baseline and contractor outreach describe construction starting in 2027. December 31 is a year-precision anchor, not an exact groundbreaking day; replaces the superseded 2024 target. This pin represents construction start, not the later reservoir opening.
Opened primary project source for sourced buildout metrics and project timeline; researched 2026-10-29.[1]
Construction research 2026-10-24: Sites Authority still describes construction as future, beginning in 2027; permits, investment decisions and a CMAR award do not establish physical work. The old 2024 start headline/date are superseded. The October 8, 2026 baseline forecasts approximately US$9.9 billion in year-of-expenditure project funding through 2035, including governance contingency. This differs from US$7.5 billion in constant 2024 dollars and the US$6.6 billion management estimate; no independent inflation or FX adjustment is made. Source quote: “expected to begin construction in 2027 in a limited capacity”[1]
Construction research 2026-10-24: Sites Authority still describes construction as future, beginning in 2027; permits, investment decisions and a CMAR award do not establish physical work. The old 2024 start headline/date are superseded. The October 8, 2026 baseline forecasts approximately US$9.9 billion in year-of-expenditure project funding through 2035, including governance contingency. This differs from US$7.5 billion in constant 2024 dollars and the US$6.6 billion management estimate; no independent inflation or FX adjustment is made. Source quote: “approximately $9.9 billion in year-of-expenditure dollars” PDF page 10, executive summary: Governance Forecast through 2035; includes governance contingency, excludes ongoing operating cost.[1]
A later KRCR report (same outlet as the pin's original source) on continued developments and pushback on the project's revised timeline.[1]
Construction program through
“2033”
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California has suffered serious droughts (1977-78, 2006-10, 2011-17), raising concern about water insecurity.
How: An offstream reservoir west of Colusa that diverts Sacramento River water through existing canals to a new reservoir 14 miles away, intended to improve supply reliability during drought.
For: Instream flows, the Delta ecosystem and water supply.
Sites Authority still describes construction as future, beginning in 2027; permits, investment decisions and a CMAR award do not establish physical work. The old 2024 start headline/date are superseded. The October 8, 2026 baseline forecasts approximately US$9.9 billion in year-of-expenditure project funding through 2035, including governance contingency. This differs from US$7.5 billion in constant 2024 dollars and the US$6.6 billion management estimate; no independent inflation or FX adjustment is made.