A pipe ruptured on the Yuba River in February, sending water cascading down a hillside north of Sacramento. It carried sediment, debris, and an oil sheen into the river below. The incident killed hundreds of young Chinook salmon, possibly thousands, at one of the worst possible moments: a period when state and federal agencies have been actively working to rebuild struggling salmon populations.
This was not a flood or a storm. The New Colgate Powerhouse penstock pipe simply failed.
What Happened at New Colgate
The New Colgate Powerhouse sits on the Yuba River roughly 50 miles north of Sacramento. It’s part of the New Bullards Bar system, a major water and power project built in the late 1960s when California was rapidly expanding its dam infrastructure to meet growing demand for water, electricity, and flood control.
PG&E paid for a substantial share of the original project in exchange for the power revenues it generated over its first 50 years. Yuba Water Agency, the public owner and operator, took the project back from PG&E in 2016 and has been making upgrades since. The upgrades weren’t enough to prevent what happened in February.
The penstock rupture also triggered a shutdown of a second powerhouse downstream, which caused an abrupt drop in river flows. That sudden change is what killed the salmon. Federal regulators have since ordered Yuba Water Agency to hire independent forensic engineers to determine the root cause and to bring in independent consultants to oversee reconstruction.
The agency doesn’t yet have a clear answer on why the pipe failed.
An Aging System Under New Pressure
Keiko Mertz, director of Friends of the River, framed the Yuba failure plainly in a recent commentary: this is an infrastructure problem, not an isolated accident.
More than one in five dams in California are over 100 years old. The dam-building era of the mid-20th century produced a fleet of structures that were designed with specific lifespans in mind. Many of those lifespans are now up, or nearly so. Penstocks, spillways, tunnels, and canals built in the same period face the same math.
Infrastructure doesn’t fail at a single moment. It degrades. Maintenance slows the curve, but age and stress accumulate faster when conditions change. California’s precipitation patterns have shifted enough over the past two decades that the hydrological assumptions baked into mid-century designs no longer hold as reliably as they once did. Atmospheric rivers deliver intense rainfall over short windows. Snowpack, which once fed a more gradual release into rivers and reservoirs, is less predictable. Infrastructure engineered for one pattern of water is now handling another.
Climate change is not a future risk layered on top of aging infrastructure. It is already interacting with it.
What Failure Actually Costs
The immediate losses at the Yuba River are measurable, if not fully tallied. The oil sheen, the sediment load, the dead salmon. Those are documented. The longer-term costs are harder to calculate.
Loss of operational flexibility at New Bullards Bar could affect reservoir management and water deliveries for a year or more, according to Mertz. Revenue that would otherwise fund forest and river habitat restoration may not materialize. The wildlife that depend on Yuba River flows, fish and otherwise, face disruption that compounds existing population stress.
This story was first reported by CalMatters.
When water infrastructure fails, the consequences move across systems simultaneously. Water deliveries stop. Flood control capacity changes. Power generation drops. Environmental conditions shift. These aren’t sequential effects; they happen at the same time, and they interact.
The Oroville Dam spillway crisis in 2017 demonstrated that risk clearly. Nearly 200,000 people were evacuated downstream after a spillway failure on the state’s tallest dam. The spillway had visible deterioration that had been flagged in inspection processes before the incident. Oroville didn’t collapse. But it came close enough to change how the state talks about dam safety.
The Yuba rupture is a smaller event, but the underlying cause is the same kind of problem.
What Should Change
California’s dam safety program conducts inspections, and the state has increased scrutiny of high-hazard structures in recent years. But inspection is not the same as investment. Identifying that infrastructure is aging or stressed doesn’t automatically produce the funding to address it. Many of California’s water projects operate as self-funding entities tied to water and power revenues. When those revenues are disrupted by a failure, the money available to fix the problem shrinks at the same moment the problem demands resources.
Federal funding for water infrastructure has moved in fits and starts. The Infrastructure Investment and Jobs Act directed billions toward water systems, but the backlog of deferred maintenance across California alone is substantial.
What the Yuba River failure clarifies is that the question facing the state is not whether aging water infrastructure will fail somewhere again. Given the age of California’s water systems, the changed precipitation environment, and the documented backlog of needed upgrades, more failures will come. The real question is whether the state builds a systematic response before the next rupture or after it.
Salmon populations in California can’t absorb many more incidents like the one on the Yuba in February. Some runs are already at or near historic lows. A penstock pipe shouldn’t be what finishes them off.