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