Class Code 6011
Dam Construction
Class code 6011 covers construction work on dams and major appurtenant works in California, including earth-fill and concrete dam construction, cofferdams, diversion structures, and related heavy civil operations. The approved pure premium rate for Sept 1, 2026 is $3.176 per $100 of payroll, a baseline for expected claim costs on these high-hazard projects. Understanding this classification helps contractors and owners control exposure and stay compliant with CA safety rules.
What Class Code 6011 Covers
This classification applies to the construction, reconstruction, or major alteration of dams and their appurtenant structures: earth-fill embankments, concrete gravity and arch dams, spillways, diversion tunnels, cofferdams, cutoff walls and foundation treatment (grouting, rock anchors). Work covered includes large-scale excavation and foundation preparation, controlled blasting in rock, installation of sheet piling and cofferdam systems, heavy concrete placement for monoliths and spillways, dewatering and pump systems, and installation of hoisting/crane systems for heavy lifts. Routine inspection, operation or maintenance of an existing dam, or hydroelectric plant operations, are generally not included under 6011 and may be classified elsewhere. The code captures the high-energy, heavy-equipment, and specialized trade work typical of major dam construction projects.
Who It Applies To
- Civil contractors and prime dam construction firms
- Heavy earthwork subcontractors (excavation, embankment placement)
- Blasting and rock-removal crews working on dam foundations
- Grouting, rock anchor, and ground-improvement contractors
- Crane, rigging, and heavy-lift operators on dam sites
- Cofferdam and dewatering system installers and operators
Common Job Duties
- Excavating and preparing dam foundations and abutments using backhoes, excavators, and drill rigs
- Controlled blasting and rock scaling to remove ledge for foundations and spillways
- Constructing cofferdams, sheet piling, and temporary diversion channels
- Concrete formwork, placement, curing, and vibration for spillways, monoliths, and cutoff walls
- Grouting, rock anchoring, and soil stabilization to reduce seepage and strengthen foundations
- Operating cranes, draglines, dozers, loaders and coordinating heavy lifts and hoisting operations
- Installing dewatering pumps, temporary drainage, and maintaining water control during construction
Common Injury Risks
Understanding the $3.176 Rate
The pure premium rate of $3.176 per $100 of payroll represents the WCIRB-approved estimate of expected claim costs for workers in this classification. Insurers use this pure premium as the base loss cost; the final premium an employer pays is that base applied to payroll and then adjusted by insurer rates, experience modification factors, schedule credits/debits, deductibles, and any policy-level adjustments. Factors that commonly move your final premium include your loss history, payroll mix (skilled operators versus laborers), jobsite safety controls, subcontractor vetting, and accurate payroll classification.
Cal/OSHA Compliance Requirements
Dam construction must comply with Cal/OSHA Title 8 Construction Safety Orders: excavation and trenching (competent person, shoring/sloping), crane and derrick operations, confined space entry and rescue, and blasting regulations where applicable. Employers must maintain an Injury and Illness Prevention Program (IIPP), competent-person oversight for excavations, written confined-space and respiratory protection programs, and training documentation for crane operators, blasters, and other specialized trades. Heat illness prevention, noise and silica controls, and pre‑task hazard analyses are routinely required on CA dam sites.
How Key HR Helps Employers Under Class Code 6011
A PEO like Key HR helps employers performing dam construction by ensuring correct classification and payroll reporting, delivering tailored loss-control programs (site audits, competent-person training, confined-space and blasting safety), and managing workers' comp claims and return-to-work plans to limit indemnity costs. Key HR can also centralize OSHA recordkeeping, provide access to experienced claims adjusters and large-insurer markets, and help negotiate program-level controls that reduce long-term workers' comp expense.
Get a QuoteFrequently Asked Questions
Does class code 6011 include small repairs or only new dam construction?
6011 is primarily for construction, reconstruction or major alteration of dams and related heavy civil works. Routine inspection, small maintenance tasks, or operation of an existing dam are typically classified under other codes; always confirm with your insurer or PEO to avoid misclassification.
What are the most effective ways to reduce workers' comp costs on dam projects?
Focus on prevention: competent-person excavation and shoring, certified crane operators, licensed blasters, written confined-space and dewatering plans, silica and noise controls, and an active return-to-work program. Accurate payroll segregation and vetting of high-risk subcontractors also lower experience-rating impact and premium.
Which Cal/OSHA trainings and permits are essential on a dam construction site?
Essential items include excavation/trenching competent-person oversight, confined-space entry permits and rescue training, crane operator certification, licensed blaster qualifications and permits, heat-illness prevention training, and documented respiratory protection and hazard communication programs. Maintain training records and site-specific safety plans to demonstrate compliance.
Quick Facts
- Class Code
- 6011
- Classification
- Dam Construction
- Pure Premium Rate
- $3.176 / $100 payroll
- Effective Date
- September 1, 2026
- Source
- WCIRB Approved Filing
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