Green Springs Reservoir Report
Nearby: Green Tank Everly
Last Updated: December 5, 2025
Green Springs is a Federal-owned dam located in Modoc, California, with a primary purpose of fire protection, stock, or small fish pond.
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Summary
Completed in 1975, this Earth-type dam stands at 9 feet high and spans 1000 feet in length, providing a storage capacity of 387 acre-feet. Despite being categorized as having a low hazard potential, Green Springs has a moderate risk assessment rating of 3, indicating a need for ongoing risk management measures.
Managed by the Forest Service, Green Springs serves as a vital resource for water storage in the area, with a maximum discharge capacity of 313 cubic feet per second. While the dam's condition assessment is currently listed as "Not Rated," regular inspections are conducted every 10 years to ensure its structural integrity and safety. The dam features an uncontrolled spillway and outlet gates, with a spillway width of 30 feet.
For water resource and climate enthusiasts, Green Springs offers a fascinating insight into the intersection of human infrastructure and natural ecosystems. With its unique design and purpose, this dam represents a critical piece of the puzzle in managing water resources for fire protection, agriculture, and wildlife in the region. As efforts continue to assess and mitigate potential risks associated with the dam, Green Springs remains a key player in the sustainable management of water in California.
Year Completed |
1975 |
Dam Length |
1000 |
Dam Height |
9 |
Primary Dam Type |
Earth |
Hydraulic Height |
7 |
Drainage Area |
4 |
Nid Storage |
387 |
Structural Height |
9 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Nid Height |
9 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Pit R Nr Canby Ca
|
56cfs |
Sf Pit R Nr Likely Ca
|
7cfs |
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.
Green Springs