Lamb Lake Estates Dam Reservoir Report

Last Updated: December 5, 2025

Lamb Lake Estates Dam, located in Johnson County, Indiana, is a privately owned structure built in 1972 with a primary purpose of water supply.


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Summary

The dam, designed by James O. Freese, is an earth dam with a height of 82 feet and a length of 790 feet, creating a reservoir with a maximum storage capacity of 13,000 acre-feet. The dam regulates flow on Indian Creek, a tributary of the White River, and provides water for recreation and domestic use in the surrounding area.

With a spillway width of 160 feet and a maximum discharge of 27,030 cubic feet per second, Lamb Lake Estates Dam has a high hazard potential and is classified as fair in terms of condition assessment. The dam is inspected biennially by the Indiana Department of Natural Resources (IDNR), with the last inspection conducted in September 2020. Despite its moderate risk rating, the dam's emergency action plan (EAP) status and risk management measures are currently undisclosed.

The dam's strategic location, efficient design, and critical role in water supply make Lamb Lake Estates Dam a key asset in managing water resources in the region. With its fair condition and high hazard potential, continued monitoring and maintenance are essential to ensure the safety and functionality of this important infrastructure for water resource and climate enthusiasts alike.

Year Completed

1972

Dam Length

790

Dam Height

82

River Or Stream

INDIAN CREEK

Primary Dam Type

Earth

Surface Area

309

Hydraulic Height

80

Drainage Area

9.34

Nid Storage

13000

Structural Height

82

Outlet Gates

Valve

Hazard Potential

High

Foundations

Rock

Nid Height

82
       
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.