Little Valley Dam Reservoir Report
Last Updated: December 12, 2025
Little Valley Dam, also known as Little Valley Reservoir, is a private-owned structure located in Washoe County, Nevada.
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Summary
Built in 1912, this Earth-type dam stands at a height of 12 feet and has a hydraulic height of 6.5 feet, serving primarily for irrigation purposes. The dam has a storage capacity of 410 acre-feet, with a normal storage level of 100 acre-feet, covering a surface area of 42 acres and draining an area of 6.3 square miles.
The dam's spillway is uncontrolled with a width of 6 feet, and it has one outlet valve. The structure has been modified in 1975 for structural improvements and has a low hazard potential with an unsatisfactory condition assessment as of the last inspection in June 2019. Despite its moderate risk level, the dam has not yet undergone Emergency Action Plan (EAP) preparations or updates, raising concerns about emergency response readiness. With its location in Coleman Canyon Creek, this dam presents an intriguing case study for water resource and climate enthusiasts interested in dam safety and management.
Overall, Little Valley Dam serves as a significant irrigation resource in the region, highlighting the importance of proper maintenance and emergency preparedness for such structures. As climate change continues to impact water resources, understanding the risks associated with dams like Little Valley becomes crucial for ensuring the safety and sustainability of water management systems in the face of evolving environmental challenges.
Years Modified |
1975 - Structural |
Year Completed |
1912 |
Dam Length |
257 |
Dam Height |
12 |
River Or Stream |
COLEMAN CANYON CREEK-TR |
Primary Dam Type |
Earth |
Surface Area |
42 |
Hydraulic Height |
6.5 |
Drainage Area |
6.3 |
Nid Storage |
410 |
Structural Height |
12 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
12 |
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.
Little Valley Dam