M.O. No. 1 Reservoir Report

Last Updated: December 5, 2025

M.O.


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Summary

No. 1 is a privately owned dam located in Converse, Wyoming, completed in 1985 by designer John A. Lambert. This earth dam serves multiple purposes, including fire protection, stock maintenance, and serving as a small fish pond. With a height of 27 feet and a length of 220 feet, M.O. No. 1 has a storage capacity of 40 acre-feet and a surface area of 3 acres, serving as an essential resource in the region.

The dam is regulated by the state of Wyoming and is used for water management in the area. Despite having a low hazard potential and fair condition assessment, M.O. No. 1 is subject to regular inspections every five years to ensure its safety and compliance with regulations. With a moderate risk assessment rating, the dam plays a crucial role in the local ecosystem and water resource management, highlighting the importance of maintaining and monitoring its structural integrity for the community.

Located in a picturesque setting near Madison Drive and Cottonwood Creek, M.O. No. 1 is a vital piece of infrastructure contributing to the water supply and environmental conservation efforts in the region. With its uncontrolled spillway and earth construction, this dam exemplifies the fusion of functional design and natural beauty, embodying the intersection of water resource management and climate sustainability.

Year Completed

1985

Dam Length

220

Dam Height

27

River Or Stream

MADISON DR, TRIB COTTONWOOD CR

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

22

Drainage Area

0.6

Nid Storage

40

Structural Height

27

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

27
       
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.