Pastorius - East Dike Reservoir Report

Last Updated: December 5, 2025

Pastorius - East Dike is a privately owned irrigation dam located in Bondad, Colorado, along the West Fork Cottonwood Gulch.


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Summary

Built in 1923, this earth dam stands at a height of 15 feet and has a storage capacity of 565 acre-feet, with a normal storage level of 295 acre-feet. The dam serves multiple purposes including irrigation, fish and wildlife pond, and recreation, showcasing its importance in supporting local ecosystems and communities.

Despite being classified as having a significant hazard potential, the dam is in fair condition as of the last assessment in August 2020. It is regularly inspected by state regulatory agencies, with a moderate risk assessment rating of 3. The dam features an uncontrolled spillway and has a maximum discharge capacity of 845 cubic feet per second, ensuring proper water management and flood control measures are in place for the surrounding area.

With its rich history dating back nearly a century, Pastorius - East Dike stands as a testament to the vital role of water resource management in sustaining agricultural activities and preserving natural habitats. Its strategic location within La Plata County, Colorado, underscores the importance of maintaining and monitoring such infrastructure to ensure the safety and well-being of the local community and environment in the face of changing climate conditions.

Year Completed

1923

Dam Length

510

Dam Height

15

River Or Stream

W FORK COTTONWOOD GULCH-TR

Primary Dam Type

Earth

Surface Area

45

Hydraulic Height

15

Nid Storage

565

Structural Height

15

Hazard Potential

Significant

Nid Height

15
       
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.