October 9, 2023
6:00 - 7:30 pm
Note: ETGS members participating virtually will receive an email with info for attending/logging into the meeting.
Geologic Conditions at the Proposed Miner Flat Dam Site in Arizona and their Impact on Foundation Design
Patrick White, PE
The Miner Flat Dam is a proposed dam on the Fort Apache Indian Reservation in Navajo County, Arizona to be constructed for the purpose of developing a reservoir to supply water to the White Mountain Apache Tribe in accordance with the requirements of the Water Rights Quantification Act of 2010. The dam will span the North Fork of the White River and is located approximately 10 miles south of Pinetop, Arizona. The dam will be constructed of roller-compacted concrete (RCC) with a structural height of about 160 feet, and the reservoir behind the dam will store up to about 8,620 acre-ft of water.
Foundation conditions present a difficult challenge to constructing the dam and providing an adequate foundation in terms of seepage control. The dam is to be located on varying materials which include highly fractured and jointed basalts, alluvial soils buried beneath the basalt flows, non-cemented sandstones, karstic limestones and siltstones, and massive gypsum beds. This presentation will discuss the geologic conditions, and various methods proposed to provide seepage control.
Patrick is a geotechnical engineer with HDR in Olympia, Washington. He is a Tennessee native and completed his bachelor's and master's degrees in civil engineering from the University of Tennessee. His 15 years of experience have focused on dams and their foundations and he currently chairs the foundation committee of the United States Society on Dams.
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Page updated September 29, 2023