North Jack Rabbit Reservoir Report

Last Updated: December 14, 2025

North Jack Rabbit is a privately owned dam located in Arvada, Wyoming, along the N Jack Rabbit Draw.


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Summary

Completed in 1969, this Earth-type dam serves multiple purposes, including fire protection, stock watering, and small fish pond maintenance. With a height of 20 feet and a length of 818 feet, the dam has a storage capacity of 146 acre-feet and a surface area of 12 acres.

Despite being classified as having a low hazard potential, North Jack Rabbit is regularly inspected and maintained to ensure its structural integrity. The dam's condition was assessed as fair during the last inspection in May 2017, and it is equipped with an uncontrolled spillway with a width of 150 feet. The risk assessment for this dam is moderate, with measures in place to manage any potential risks.

Located in Johnson County, Wyoming, North Jack Rabbit dam plays a crucial role in providing water resources for fire protection and agricultural activities in the area. With its strategic location and functional design, this dam serves as a vital infrastructure for water management and climate resilience in the region.

Year Completed

1969

Dam Length

818

Dam Height

20

River Or Stream

N JACK RABBIT DRAW

Primary Dam Type

Earth

Surface Area

12

Hydraulic Height

15

Nid Storage

146

Structural Height

21

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

21
       
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.