Sedimentation Pond Hg-1 Reservoir Report
Last Updated: December 5, 2025
Sedimentation Pond Hg-1, located in Hamilton, Colorado, is a privately owned structure designed for flood risk reduction along the Hayden Gulch river.
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Summary
Completed in 1979, this earth dam stands at a height of 40 feet with a hydraulic height of 50 feet, serving the primary purpose of flood control. With a maximum storage capacity of 44 acre-feet and a normal storage of 25 acre-feet, Sedimentation Pond Hg-1 covers a surface area of 3 acres and has a maximum discharge capacity of 1090 cubic feet per second.
Despite being rated as having a low hazard potential, Sedimentation Pond Hg-1 has a high risk assessment score of 2 due to its location and potential impact on the surrounding area. The structure has not been recently inspected since January 1991, with an inspection frequency of every 6 years. The condition assessment is currently listed as "Not Rated," and there is no emergency action plan (EAP) in place for this dam. With the risk management measures and inundation maps not yet prepared, there is a need for updated assessments and emergency planning to ensure the safety and efficiency of Sedimentation Pond Hg-1 in the face of potential climate challenges and water resource management issues.
Year Completed |
1979 |
Dam Length |
1300 |
Dam Height |
40 |
River Or Stream |
HAYDEN GULCH |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
50 |
Nid Storage |
44 |
Structural Height |
50 |
Hazard Potential |
Low |
Nid Height |
50 |
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.
Sedimentation Pond Hg-1