The Lake Reservoir Report

Last Updated: December 21, 2025

The Lake, also known as Fagan Lake, is a private water resource located in Pima County, Arizona.


°F

°F

mph

Wind

%

Humidity

Summary

Managed by the Arizona Department of Water Resources, this earth dam stands at a height of 30.8 feet and spans 370 feet in length, providing essential functions such as fire protection, stock watering, and supporting small fish populations. With a storage capacity of 34.9 acre-feet and a surface area of 3.4 acres, The Lake serves as a crucial resource for the surrounding area.

Despite its low hazard potential, The Lake is subject to state regulation, inspection, and enforcement to ensure its structural integrity and safety. The dam's uncontrolled spillway, with a width of 41 feet, helps manage excess water flow during periods of high discharge. While the condition of the dam is currently not rated, its risk assessment is moderate, highlighting the need for ongoing monitoring and risk management measures. Positioned along an unnamed stream leading to Davidson Canyon, The Lake plays a vital role in water resource management in the region.

For water resource and climate enthusiasts, The Lake represents a prime example of a privately owned earth dam that supports various essential purposes for the community, from wildlife habitat creation to water storage for emergency situations. As a regulated structure under the jurisdiction of the Arizona Department of Water Resources, The Lake stands as a testament to the importance of maintaining and managing water resources in a sustainable and responsible manner. With its moderate risk assessment and low hazard potential, The Lake serves as a focal point for ongoing monitoring and risk management efforts to ensure the safety and efficiency of this vital water infrastructure.

Dam Length

370

Dam Height

30.8

River Or Stream

UNNAMED TO DAVIDSON CANYON - TR

Primary Dam Type

Earth

Surface Area

3.4

Hydraulic Height

30.8

Nid Storage

34.9

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

31
       
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.