Ireland #1 Reservoir Report

Last Updated: December 5, 2025

Ireland #1 is a privately owned irrigation dam located in Weld County, Colorado, along Boxelder Creek.


°F

°F

mph

Wind

%

Humidity

Summary

Built in 1919, this Earth dam stands at 13 feet high and stretches 440 feet in length, with a storage capacity of 156 acre-feet. The dam serves the primary purpose of irrigation, with a normal storage capacity of 116 acre-feet and a maximum discharge rate of 882 cubic feet per second.

Despite its age, Ireland #1 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The dam operates with an uncontrolled spillway system, with a spillway width of 32 feet. While the risk assessment for this dam is considered moderate, with a DSAC assigned date unknown, there are currently no emergency action plans or inundation maps prepared for this structure. With state regulation and inspection in place, Ireland #1 continues to support agricultural activities in the region while maintaining a relatively low risk profile.

Year Completed

1919

Dam Length

440

Dam Height

13

River Or Stream

BOXELDER CREEK

Primary Dam Type

Earth

Surface Area

14

Hydraulic Height

13

Drainage Area

10

Nid Storage

156

Structural Height

13

Hazard Potential

Low

Nid Height

13
       
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.