Weber - South Dam Reservoir Report

Last Updated: December 5, 2025

Weber - South Dam, located in Montezuma County, Colorado, is a vital earth dam constructed in 1902 by the USDA NRCS for irrigation purposes along the West Fork Mancos River.


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Summary

This privately-owned structure stands at a height of 25 feet with a hydraulic height of 25 feet and a structural height of 29 feet, stretching 961 feet in length. It has a storage capacity of 652 acre-feet, with a normal storage level of 442 acre-feet, serving multiple functions including fire protection, stock, and small fish pond management.

The dam's spillway, with a width of 220 feet, is uncontrolled, and it is equipped with a single slide (sluice gate) outlet gate. Despite being classified as having a low hazard potential, it undergoes regular inspections every six years, with the last assessment in April 2019 revealing a satisfactory condition. With a moderate risk assessment score of 3, the dam is regulated, permitted, inspected, and enforced by the Colorado Division of Water Resources, ensuring its safety and functionality for the community of Mancos and the surrounding areas.

Weber - South Dam is an essential piece of infrastructure that not only supports agricultural irrigation but also contributes to fire protection and wildlife management in the region. With its historical significance dating back over a century, this earth dam continues to play a crucial role in water resource management and climate resilience efforts in Colorado, highlighting the importance of sustainable water infrastructure in the face of changing environmental conditions.

Year Completed

1902

Dam Length

961

Dam Height

25

River Or Stream

WEST FORK MANCOS RIVER-TR

Primary Dam Type

Earth

Surface Area

42

Hydraulic Height

25

Nid Storage

652

Structural Height

29

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Nid Height

29
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.