Blatt Lake Reservoir Report

Last Updated: December 5, 2025

Blatt Lake, located in Sublette, Wyoming, is a private fish and wildlife pond that serves as a vital resource for the local ecosystem.


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Summary

Built in 2001, this Earth dam is designed to hold a maximum storage capacity of 600 acre-feet of water and covers a surface area of 35.6 acres. Despite its low hazard potential, the dam's condition assessment indicates it is currently in poor condition, warranting further inspection and potential maintenance in the future.

The dam's primary purpose is to provide a habitat for fish and wildlife, with a normal storage capacity of 149 acre-feet. The lake is fed by Willow Creek offstream and boasts a spillway width of 30 feet. While the risk assessment is categorized as moderate, with a risk level of 3, the dam is not under the jurisdiction of the US Army Corps of Engineers. Notably, the dam is situated on an unnamed ranch in an idyllic rural setting, making it a picturesque location for water resource and climate enthusiasts to explore and appreciate.

Year Completed

2001

Dam Length

2650

Dam Height

14

River Or Stream

WILLOW CREEK OFFSTREAM

Primary Dam Type

Earth

Surface Area

35.6

Hydraulic Height

11

Drainage Area

0.1

Nid Storage

600

Structural Height

18

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

18
       
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.