Don Pedro Dike B Reservoir Report
Nearby: Don Pedro Dike C Don Pedro Main
Last Updated: December 5, 2025
Don Pedro Dike B, located in the picturesque Tuolumne River in California, is a vital piece of infrastructure designed by Bechtel and completed in 1971 for hydroelectric purposes.
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Summary
This earth-type dam stands at a height of 36 feet and stretches 560 feet long, boasting a storage capacity of 2.3 million acre-feet and serving multiple functions including flood risk reduction, irrigation, and recreation. The dam's location in La Grange makes it a key player in the state's water resource management, with state regulatory agencies ensuring its safe operation and maintenance.
Managed by a public utility, Don Pedro Dike B is under the jurisdiction of state and federal agencies, including the Department of Water Resources and the Federal Energy Regulatory Commission. With a high hazard potential and risk assessment rating, the dam's safety and emergency preparedness measures are periodically evaluated, with an Emergency Action Plan last revised in December 2020. The dam's association with other structures in the area highlights its interconnectedness in the region's water management system, with inspections conducted regularly to ensure its structural integrity and functionality.
As a notable feature along the Tuolumne River, Don Pedro Dike B not only contributes to hydroelectric power generation but also supports fish and wildlife habitats, reflecting a harmonious balance between human development and environmental conservation. Its historical significance and ongoing role in water resource management underscore the importance of sustainable infrastructure practices in the face of climate change and increasing water demands. Enthusiasts of water resources and climate resilience will find Don Pedro Dike B a fascinating example of engineering ingenuity and environmental stewardship in action.
Year Completed |
1971 |
Dam Length |
560 |
Dam Height |
36 |
River Or Stream |
Tuolumne River |
Primary Dam Type |
Earth |
Surface Area |
13000 |
Nid Storage |
2300000 |
Structural Height |
36 |
Hazard Potential |
High |
Nid Height |
36 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Fleming Meadow - Don Pedro Rec Area
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Blue Oaks - Don Pedro Rec Area
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Barrett Cove Rec Area
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Horseshoe Bend Rec Area
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C25
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C27
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Don Pedro Dike B
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