From this
to this
I guess it was 13 months.
Much smaller and different but no reason they can't have more people working at the same time to speed it up.
This article is an interesting read, here's a couple bits.
Rethinking Procurement Practices
One could argue it’s easy to go fast if you are paying a premium and perhaps skimping on quality. But that was not what MnDOT did. Rather, they challenged conventional procurement practices and approached the I-35 bridge to rebuild in a radically different way. The results were nothing short of spectacular, with the bridge taking only 13 months to complete while being under budget and winning almost two dozen quality awards.
A key differentiator: moving from a transaction-based mindset to a more collaborative “win-win” approach of working with contractors to achieve clearly defined desired outcomes. This approach is what University of Tennessee researchers coined a ‘Vested’ sourcing business model because the buying organization and the supplier have a vested interest in the outcomes and each other’s success.
Second, they challenged procurement to abandon rigid processes and seek a more collaborative approach with potential suppliers. Rather than telling suppliers “how” to build the bridge, they asked suppliers to propose the best way to meet the state’s timing, budget, quality, and safety goals.
A Pricing Model with Incentives. Vested does not guarantee higher profits for suppliers. Yet it is essential to understand that suppliers are asked to take calculated risks and put skin in the game to achieve outcomes. The model must incentivize a supplier to make strategic investments in processes that can generate more value than the transaction-based model. MnDOT and Flatiron Manson applied a shared risk/shared reward philosophy. Their agreement had a firm fixed price base contract of $233.8 million. The amount was MnDOT’s maximum cost liability and the only guaranteed payment for the contractor. But there was a provision to handle unknown, potentially costly situations. Risk was balanced fairly as the parties used a portfolio of incentives to further align interests, including payments for time-schedule savings. The result? Flatiron Manson earned $25 million more by completing the bridge under budget, ahead of schedule and at record quality and safety levels.
Will Maryland Learn From MnDOT?
MnDOT used collaboration and innovative thinking to complete a huge job under budget, ahead of schedule, and at exceptional safety and quality levels. The state-of-the-art I-35W Bridge opened for traffic only 13 months after the collapse. The 1,223-foot span won the America’s Transportation Awards’ grand prize for “representing the best in innovative management, accountability, and timeliness.”
https://www.forbes.com/sites/katevi...ess-with-i-35-bridge-rebuild/?sh=5570aaef32a9