Neil Reservoir Report

Nearby: Anita Bass

Last Updated: December 5, 2025

Neil is a private irrigation dam located in the scenic surroundings of Johnson, Wyoming, serving multiple purposes such as fire protection, stock maintenance, and irrigation.


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Summary

Constructed in 2008 by designer Hugh Lowham, this Earth-type dam stands at a height of 32 feet and stretches over a length of 428 feet, with a storage capacity of 94 acre-feet. Situated on Canopy Draw, Neil plays a crucial role in managing the water resources in the area, with a low hazard potential and fair condition assessment.

Managed by the Wyoming state regulatory agency SEO, Neil undergoes regular inspections, with the last assessment conducted in August 2021. The dam boasts a spillway width of 80 feet and a maximum discharge capacity of 1192 cubic feet per second, ensuring efficient water flow control during peak times. Despite its moderate risk assessment rating, Neil remains an integral part of the local water infrastructure, contributing to the sustainable utilization of water resources for agriculture and environmental preservation in the region.

With Liz Cheney (R) representing the Congressional District of Wyoming where Neil is located, the dam's strategic positioning on an unnamed ranch in Sec 2 makes it a vital asset for water management in the area. The dam's primary purpose of irrigation, coupled with its ability to support various water-related activities, highlights its importance in maintaining a balance between water resource utilization and environmental conservation. Climate and water resource enthusiasts would find Neil's design and operational details intriguing, showcasing the intersection of engineering excellence and environmental stewardship in water infrastructure management.

Year Completed

2008

Dam Length

428

Dam Height

32

River Or Stream

CANOPY DRAW

Primary Dam Type

Earth

Surface Area

6.16

Hydraulic Height

27

Drainage Area

0.28

Nid Storage

94

Structural Height

49

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

49
       
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.