Horse Creek No. 2 Flood Control Reservoir Report

Last Updated: December 8, 2025

Horse Creek No.


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Summary

2 Flood Control, located in Antelope Coal Mine, Campbell County, Wyoming, is a private flood control structure designed by Nick Bateston and completed in 2007. This earth dam, standing at 47 feet tall with a hydraulic height of 37 feet and a structural height of 62 feet, serves the primary purpose of flood control along Horse Creek. With a storage capacity of 1422 acre-feet and a surface area of 59.14 acres, the dam plays a crucial role in mitigating potential flood risks in the region.

The dam's spillway, an uncontrolled type with a width of 40 feet, can handle a maximum discharge of 5572 cubic feet per second. Equipped with three valve outlet gates, the dam has been inspected regularly, with the last assessment in July 2017 rating its condition as fair and its hazard potential as low. Despite being a moderate risk structure, the Horse Creek No. 2 Flood Control is well-maintained and meets regulatory standards set by the state, making it a vital asset in the region's water resource and climate resilience efforts.

Owned privately, this flood control structure not only safeguards the local community from potential flooding but also contributes to the overall water management strategies in the area. With its strategic location along Horse Creek and its significant storage capacity, the Horse Creek No. 2 Flood Control stands as a testament to effective dam engineering and maintenance practices, ensuring the safety and well-being of residents and ecosystems downstream.

Year Completed

2007

Dam Length

1500

Dam Height

47

River Or Stream

HORSE CREEK

Primary Dam Type

Earth

Surface Area

59.14

Hydraulic Height

37

Drainage Area

6.7

Nid Storage

1422

Structural Height

62

Outlet Gates

Valve - 3

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

62
       
Seasonal Comparison

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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.