Petersen Site 1 Lake Reservoir Report
Nearby: Voigt Lake Dam Boot Ranch Dam 1441
Last Updated: March 11, 2026
Petersen Site 1 Lake, located in Gillespie, Texas, serves primarily for irrigation purposes and was completed in 1963.
Summary
This Earth dam stands at a height of 28 feet with a length of 360 feet, providing a storage capacity of 75 acre-feet. Situated along Riley Creek, this private-owned reservoir does not have a spillway and is not regulated by the state for enforcement. Despite being last inspected in 1976, the dam's hazard potential is not available, indicating a need for further assessment.
With its location in the Galveston District and under the ownership of a private entity, Petersen Site 1 Lake presents a unique opportunity for water resource and climate enthusiasts to explore the intersection of human infrastructure with natural water systems. The dam's high risk assessment highlights the importance of monitoring and maintaining such structures to prevent potential hazards. By delving into the historical context and design characteristics of this reservoir, enthusiasts can gain valuable insights into the challenges and considerations involved in managing water resources for agricultural purposes.
As a key component of the regional water system, Petersen Site 1 Lake offers a case study for evaluating the resilience and sustainability of irrigation infrastructure in the face of changing climate conditions. Understanding the dam's structural integrity, storage capacity, and operational mechanisms can provide valuable lessons for optimizing water management practices and ensuring the long-term viability of water resources in Texas. By engaging with the data and characteristics of this reservoir, enthusiasts can deepen their appreciation for the complex interplay between human activities and natural systems in shaping the future of water resource management.
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Humidity
15-Day Weather Outlook
Year Completed |
1963 |
Dam Length |
360 |
Dam Height |
28 |
River Or Stream |
RILEY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
28 |
Nid Storage |
75 |
Structural Height |
28 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
28 |
Seasonal Comparison
5-Day Hourly Forecast Detail
Nearby Streamflow Levels
Pedernales Rv Nr Fredericksburg
|
3cfs |
Sandy Ck Nr Kingsland
|
3cfs |
Beaver Ck Nr Mason
|
4cfs |
Llano Rv At Llano
|
204cfs |
Pedernales Rv Nr Johnson City
|
5cfs |
Llano Rv Nr Mason
|
89cfs |
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.
Petersen Site 1 Lake