Lake Hattie Reservoir Report

Last Updated: December 5, 2025

Lake Hattie, located in Albany County, Wyoming, is a privately owned irrigation reservoir with a significant storage capacity of 130,182 acre-feet.


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Summary

Constructed in 1912, the earth dam stands at a height of 43 feet and has a spillway width of 100 feet for uncontrolled releases. The reservoir covers a surface area of 3,032 acres and is fed by the offstream flow of the Laramie River.

With a drainage area of 31.6 square miles, Lake Hattie plays a crucial role in supporting agricultural activities in the region. The dam, designed by Paul A. Rechard, is regulated and inspected by the Wyoming State Engineer's Office, ensuring its structural integrity and compliance with state regulations. Despite being categorized as having a significant hazard potential, the dam's condition assessment in 2020 rated it as fair, indicating a moderate risk level.

Although Lake Hattie's primary purpose is irrigation, the reservoir also serves as a recreational spot for fishing and boating enthusiasts. As a key water resource in the area, the reservoir's management and maintenance are essential to sustain water supply for agricultural operations and preserve the ecosystem. Climate and water resource enthusiasts can appreciate the engineering behind Lake Hattie and its role in supporting both human activities and environmental conservation efforts.

Year Completed

1912

Dam Length

1480

Dam Height

43

River Or Stream

LARAMIE RIVER OFFSTREAM

Primary Dam Type

Earth

Surface Area

3032

Hydraulic Height

38

Drainage Area

31.6

Nid Storage

130182

Structural Height

43

Outlet Gates

Slide (sluice gate) - 0

Hazard Potential

Significant

Foundations

Soil

Nid Height

43
       
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.