Salt Lake City Temple: A $2.4 Billion Seismic Retrofit and Urban Planning History

Seismic Retrofit of Salt Lake City Temple

• 🏗️ The world's largest Mormon temple in Salt Lake City is undergoing a massive $2.4 billion retrofit to protect it from earthquakes.
• ⚠️ Geologists estimate a 57% probability of a magnitude 6 or greater earthquake in the next 50 years, posing a significant risk to the historic structure.
• 💡 The project employs base isolation, a technique where the building is decoupled from ground motion, allowing it to move independently during seismic activity.
• 🛠️ This involves excavating around the original foundations, installing new concrete foundations with transfer beams, and placing 98 immense base isolators, each weighing 8,000 kilos.
• ⏳ The complex retrofitting process, including reinforcing walls and spires, has extended the project timeline to 2026, with reopening expected in 2027.

Historical Context of Salt Lake City

• 🗺️ The Salt Lake City Temple, completed over 130 years ago, is central to the city's unique urban plan, known as the Plat of Zion.
• 🏛️ Founded in 1847 by Brigham Young, the city was designed as a secluded, self-sustaining community with a deliberate grid layout and unusually wide streets.
• 🧱 The temple itself took over 40 years to construct, facing obstacles like conflict with US troops and the challenge of transporting granite from Little Cottonwood Canyon.
• 🏡 The city's large, 10-acre blocks, divided into eight lots, facilitated a hybrid rural-urban life, functioning as micro-farms and firebreaks.

Preservation and Urban Development

• 📈 Salt Lake City has historically struggled with preserving its heritage buildings due to development pressures and rising land values.
• ✨ The extensive $2 billion investment in the temple's seismic resilience aims to demonstrate the importance of preservation work and potentially inspire similar efforts in the city.
• 🚀 Upon completion, the temple will be transformed from a structure in danger of collapse to one of the most seismically resilient historic buildings globally.