Decker Reservoir Report
Nearby: Giffin #2 (Upper) Giffin #1 (Lower)
Last Updated: December 5, 2025
Decker, also known as Decker & Pearce or Carr Reservoir, is a privately owned dam located in Weld County, Colorado.
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Summary
Built in 1892 by designer J. Hislop, this earth dam stands at a height of 14 feet and serves primarily for irrigation purposes. With a storage capacity of 680 acre-feet, Decker reservoir covers a surface area of 31 acres and is regulated by the Colorado Department of Water Resources.
The dam spans 962 feet in length and features an uncontrolled spillway with a width of 800 feet. Despite being classified as having a low hazard potential, Decker is regularly inspected and deemed to be in satisfactory condition as of its last assessment in 2009. The surrounding area, including the Spring Creek-OS river or stream, benefits from the moderate risk management measures in place for this structure.
Representing a piece of Colorado's water infrastructure history, Decker serves as a vital resource for irrigation in the region. With its strategic location in Pierce and oversight by the state regulatory agencies, this dam continues to play a crucial role in water resource management and climate resilience efforts in the area.
Year Completed |
1892 |
Dam Length |
962 |
Dam Height |
14 |
River Or Stream |
SPRING CREEK-OS |
Primary Dam Type |
Earth |
Surface Area |
31 |
Hydraulic Height |
8 |
Nid Storage |
680 |
Structural Height |
14 |
Outlet Gates |
Valve - 0 |
Hazard Potential |
Low |
Nid Height |
14 |
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.
Decker