Lake Ohana Dam #1 Reservoir Report

Last Updated: December 13, 2025

Lake Ohana Dam #1, located in Pacific Junction, Iowa, is a privately-owned earth dam that was completed in 2007 by Leo A.


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Summary

Daly Engineers. This dam stands at a height of 46 feet and spans a length of 1070 feet, creating a reservoir with a capacity of 434 acre-feet. The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its structural integrity.

The dam's primary purpose is to control the flow of Tr-Pony Creek and protect the surrounding area from flooding. With a surface area of 17.4 acres and a drainage area of 0.26 square miles, Lake Ohana Dam #1 plays a crucial role in managing water resources in Mills County, Iowa. Despite being classified as having a significant hazard potential, the dam is currently in fair condition according to its most recent assessment in August 2019.

In the event of an emergency, the dam has protocols in place, although specific details about emergency action plans and risk management measures are not provided in the available data. Lake Ohana Dam #1 serves as a vital infrastructure element in the local water management system, highlighting the importance of proper maintenance and monitoring to ensure the safety and sustainability of water resources in the region.

Year Completed

2007

Dam Length

1070

Dam Height

46

River Or Stream

Tr- Pony Creek

Primary Dam Type

Earth

Surface Area

17.4

Drainage Area

0.26

Nid Storage

434

Hazard Potential

Significant

Foundations

Soil

Nid Height

46
       
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.