Rawlins Wastewater Treatment Plant (S 1) Reservoir Report

Last Updated: December 5, 2025

The Rawlins Wastewater Treatment Plant (S 1) in Carbon, Wyoming, plays a crucial role in managing the wastewater from the surrounding area.


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Summary

Owned by the local government and regulated by the State of Wyoming, this facility was designed by Mickey M. Yamashiro and completed in 1978. Situated near Sugar Creek, a tributary of the North Platte River, the plant utilizes an earth dam with stone core to control water flow and ensure proper treatment of wastewater.

With a dam height of 5 feet and a hydraulic height of 14 feet, the Rawlins Wastewater Treatment Plant has a significant hazard potential and is classified as high risk. Despite this, the condition assessment in 2017 rated the facility as fair. The plant has a storage capacity of 178 acre-feet and serves a drainage area of 0.2 square miles. The last inspection in 2017 indicated a need for regular monitoring and maintenance to ensure the plant's continued operation and safety.

Overall, the Rawlins Wastewater Treatment Plant is a vital infrastructure piece for water resource management in the area. With its location in Carbon, Wyoming, and proximity to the North Platte River, the plant not only treats wastewater but also plays a role in environmental protection and sustainable water management. Ongoing risk assessment and maintenance efforts are essential to ensure the plant's long-term effectiveness and safety for the community and surrounding ecosystem.

Year Completed

1978

Dam Length

6850

Dam Height

5

River Or Stream

SUGAR CREEK, TRIB NORTH PLATTE

Primary Dam Type

Earth

Surface Area

140

Hydraulic Height

14

Drainage Area

0.2

Nid Storage

178

Structural Height

17

Hazard Potential

Significant

Foundations

Soil

Nid Height

17
       
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.