Located in Thatcher, Idaho, the Andreasen Lower dam plays a crucial role in irrigation, serving as a key water resource for the region since its completion in 1960. With a height of 33.1 feet and a hydraulic height of 29.3 feet, the dam holds a storage capacity of 100 acre-feet, providing water for agricultural purposes in the area. The dam is primarily constructed with earth and stone materials, supported by rock and soil foundations, making it a vital infrastructure for water management in the region.

State regulated and inspected by the Idaho Department of Water Resources, Andreasen Lower dam is deemed to have a significant hazard potential, although its condition assessment as of August 2017 was satisfactory. The dam has a spillway type of uncontrolled with a maximum discharge capacity of 12 cubic feet per second, ensuring proper water flow management during peak times. Despite facing a moderate risk level, the dam continues to meet guidelines for operation and maintenance, highlighting its importance in ensuring water security for the surrounding community.

With its location in Franklin County, Idaho, Andreasen Lower dam stands as a testament to effective water resource management, providing essential irrigation water for agricultural activities in the region. As a privately owned structure, the dam undergoes regular inspections and maintenance, ensuring its structural integrity and fulfilling its primary purpose of supporting the local farming community. As climate change impacts water availability, the Andreasen Lower dam remains a vital infrastructure for sustainable water resource management in the area, playing a crucial role in maintaining the region's agricultural productivity and water security.