Mountain Supply # 2 Reservoir Report
Nearby: Mountain Supply # 1 Rawhide
Last Updated: December 5, 2025
Mountain Supply # 2, also known as Round Butte, is a vital water resource infrastructure located in Larimer, Colorado, specifically in the city of Wellington.
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Summary
Owned and regulated by local government authorities, this dam was completed in 1904 and serves the primary purpose of irrigation. Standing at a height of 25 feet and stretching 3500 feet in length, it has a storage capacity of 1115 acre-feet, with a normal storage capacity of 715 acre-feet.
Despite its low hazard potential, Mountain Supply # 2 has been assessed as unsatisfactory in condition, with the last inspection conducted in May 2015. The risk assessment for this dam is considered high, indicating potential vulnerabilities that need to be addressed. With no spillway and limited drainage area, ensuring the safety and stability of this structure is crucial for both water supply management and climate resilience in the region. As climate change continues to impact water resources, the maintenance and upkeep of Mountain Supply # 2 will be essential for sustainable water management in the area.
Year Completed |
1904 |
Dam Length |
3500 |
Dam Height |
25 |
River Or Stream |
SAND CREEK |
Primary Dam Type |
Earth |
Surface Area |
30 |
Hydraulic Height |
25 |
Nid Storage |
1115 |
Structural Height |
25 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
Mountain Supply # 2