Kansas City, Mo.
Design-build project for a half-mile section of trail between NW 40th and NW 37th Streets that presented specific engineering and construction challenges. Encompassing both concrete pathway and wooden boardwalk, the trail traversed more than 60 feet of vertical grade change and required navigating three ravines and one low-lying area. The solution was nearly 600 linear feet of built-in-place, stick-framed wooden boardwalks built on more than 60 augured pier footings and eight individual abutments. Framing consisted of more than 18,000 board feet of treated dimensional lumber, some of which is 14 feet above the ground. Concrete trail connects the boardwalks.
ADA compliance was critical in design and construction, as was greenway conservation and preservation of the native landscape. Site clearing was kept to three-quarters of an acre to avoid disturbing native plants and trees. Earthwork cuts and fills were manipulated to lessen the environmental impact by shaping only 900 cubic yards of dirt and using recycled concrete as aggregate base. Restorative wildflower seeding with fiber matrix hydromulch was used to reestablish the greenspace of disturbed areas, substantially reducing the need for net base products.