Twin Pots Reservoir Report

Reservoir Report

Utah

Nearby: Moon Lake Yellowstone Power Diversion

Last Updated: December 4, 2025

Twin Pots is a privately owned irrigation structure located in Altonah, Duchesne County, Utah.

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Summary

Built in 1931, this earth dam stands at a hydraulic height of 35 feet and a structural height of 38 feet, with a length of 515 feet. The dam has a storage capacity of 4600 acre-feet, with a normal storage level of 4050 acre-feet, serving the primary purpose of irrigation. The reservoir is situated on the West Fork Lake Creek-offstream and is under the jurisdiction of the Utah Division of Water Rights.

Despite its age, Twin Pots remains in fair condition with a high hazard potential, prompting regular state inspections and enforcement to ensure its safety and integrity. The dam has a maximum discharge capacity of 46 cubic feet per second and is equipped with an unspecified spillway type. While the dam has not undergone any significant modifications over the years, it is subject to an annual inspection frequency to assess its ongoing performance. Twin Pots poses a risk of inundation, and its emergency action plan status and risk management measures have yet to be fully documented.

Enthusiasts of water resources and climate in the area can appreciate Twin Pots for its historical significance in irrigation infrastructure and its role in managing water resources in the region. The dam's location in the picturesque surroundings of Altonah adds to its appeal, while its high hazard potential underscores the importance of regular maintenance and monitoring to mitigate potential risks. Twin Pots stands as a testament to the engineering ingenuity of its time and serves as a vital piece of infrastructure in sustaining agricultural activities in the Duchesne County area.

Year Completed	1931
Dam Length	515
River Or Stream	WEST FK LAKE CREEK-OFFSTREAM
Primary Dam Type	Earth
Hydraulic Height	35
Drainage Area	1
Nid Storage	4600
Structural Height	38
Hazard Potential	High
Nid Height	38

Explore Interactive Map

TWIN POTS

Reservoir Report • Water Levels • Weather Forecast

December 4, 2025

Year_Completed	1931
Dam_Length	515
River_Or_Stream	WEST FK LAKE CREEK-OFFSTREAM
Primary_Dam_Type	Earth
Hydraulic_Height	35
Drainage_Area	1
Nid_Storage	4600
Structural_Height	38
Hazard_Potential	High
Nid_Height	38

Seasonal Comparison

Weather Forecast

Nearby Streamflow Levels

Lake Fork River Bl Moon Lake Nr Mountain Home 4.55cfs	5cfs
Yellowstone River Near Altonah 49.2cfs	49cfs
Yellowstone R. At Bridge Campgrnd 26.6cfs	27cfs
Rock Creek Near Mountain Home 38.3cfs	38cfs
Lake Fork River Ab Moon Lake 31.6cfs	32cfs
Duchesne River Near Tabiona 81.3cfs	81cfs

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.