Phase 3 of The Underline is a 7.36-mile segment that connects SW 19th Ave near the Vizcaya Metrorail station to the Dadeland South Metrorail station. The entire segment links various communities including City of Miami, Coral Gables, South Miami, and Unincorporated Miami-Dade County.
On October 18th, 2022, Miami-Dade County awarded the construction contract to NV2A Central Joint Venture. The total estimated construction cost for Phase 3 is $109 million.
Phase 3 will be built on three key drivers: safe multi-modal transportation, nature, and community. These priorities were created through a series of public and community input meetings during the Master Plan, and the Phase 1 and Phase 2 design process.
Phase 3 will feature numerous bioswales, green infrastructure, and below-ground drainage that will help with stormwater flooding and runoff.
It will also feature 400,000 native vegetation including 3,000 trees, plants and grasses that support The Underline master plan restoration of the Pine Rockland, Hardwood Hammock, Pollinator and Wet Prairie ecosystems.
Tree protection, relocation, or replacement: Part of pre-construction efforts include the removal and relocation of trees along the Phase 3 segment. In preparation for this work, trees that remain are protected by orange fencing. For trees being relocated or replaced, informational tags with QR codes will be on those trees prior to any project work.
Other notable project components include:
Safe biking and walking paths, lighting, and improved crosswalks
Resting areas along the path with oolitic limestone boulders or benches
Hydration stations in the amenity areas
Bike racks and repair stations in various locations
Dog-friendly features at each amenity area
Trash and recycling receptacles throughout the corridor
LED lighting that is Dark Sky compliant
Green infrastructure: Bioswale native landscaping with natural infiltration planting
Free Wi-Fi service
Programmable areas for numerous public events, cultural, educational, and health and wellness programs
Improvements to 24 intersections along US1
Phase 3 is expected to be completed in 2026. Once all three phases are completed, The Underline will be Miami-Dade County’s first true mobility corridor uniting all modes of transportation and enhancing accessibility to eight Metrorail stations within its path and the neighboring communities.
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