The Centennial Greenway is being constructed in phases to create a 17-mile corridor that traverses through seven cities to connect people to history, parks, community amenities, and regional assets.

Since 2012, Alta has worked with Great Rivers Greenway and several communities to address complicated urban greenway situations, such as safe crossings at highway intersections and connections over high-motor-vehicle-capacity bridges. Our safe, convenient, and intuitive greenway solutions are focused on the comfort and enjoyment of all trail users. The greenway is encouraging more environmentally-friendly forms of transportation and providing vibrant recreational opportunities that also increase the connectivity of the region.

Our specialized knowledge of planning and design for bicycle and pedestrian travel has assisted with the construction of several key phases of the greenway:

  • Alignment Plan for the City of St. Louis
  • Washington University Centennial Greenway, St. Louis
  • I-70 at Delmar Street Intersection Crossing, University City: Alta led development of design and construction documents, providing a safe, ADA accessible greenway connection through this complicated intersection that includes on- and off-ramps for I-70. A contra-flow bike lane, curb bump-outs, and specialized bike signals facilitate on- and off-street trail transitions and the intersection crossings. Additionally, Alta worked to design the crossing to support active transportation connections to adjacent businesses.
  • Greenway Extension, St. Charles: This phase of the greenway extends from the Heritage Museum across the Rte. 94/364 Interchange and will eventually link to the Katy Trail. Alta was responsible for conceptual alignment design and selection of the preferred option. We then completed design of bicycle and pedestrian facilities, including working with MoDOT and the City to design the crossing at the Rte. 94/364 Interchange.
  • Greenway Extension, St. Peters: Alta is leading construction phase services, including preparing plans and specifications required to acquire needed property rights and construct this phase of the greenway.