In a landmark investment in regional water infrastructure, South San Joaquin Irrigation District (SSJID) and Oakdale Irrigation District (OID) have officially launched the $84 million Canyon Tunnel Project—an ambitious initiative to protect and modernize water delivery for thousands of Central Valley residents and farmers.
On July 1, 2025, South San Joaquin Irrigation District (SSJID) officially awarded the construction contract to Drill Tech Drilling & Shoring, Inc., a firm with significant experience in complex tunneling and infrastructure work. The project broke ground in a ceremonial kickoff on August 4 near Goodwin Dam, drawing dozens of officials, stakeholders, and community members.
The 12,000-foot tunnel will bypass a vulnerable section of the century-old Joint Supply Canal (JSC), which has been increasingly threatened by landslides and rockfalls. A major slide in 2013 nearly halted early-season water deliveries—an event that underscored the urgent need for a long-term solution.
“This tunnel is a lifeline for our communities,” said Glenn Spyksma, SSJID Board President. “We’re building a future where water keeps flowing no matter what nature throws our way.”
Spanning steep Sierra foothills and an ancient buried riverbed, the Canyon Tunnel is designed to ensure uninterrupted water delivery for generations. SSJID serves over 50,000 acres of farmland and provides water to cities including Manteca, Lathrop, Escalon, and Tracy. OID, in turn, delivers water to 26,000 acres and the community of Knights Ferry.
The two districts are jointly funding the project, with SSJID contributing 72% and OID 28%, based on historical water usage from the shared JSC. According to OID Board President Tom Orvis, “This project will take us into the next 100 years with confidence, safety, and strength.”
Construction is underway and expected to be completed by 2028. Once operational, the tunnel will offer a more resilient, low-maintenance alternative to the aging canal, significantly reducing infrastructure risks during critical irrigation periods.
