The use of micropiles has grown significantly since their conception in the 

1950s, and in particular since the mid-1980s. Micropiles have been used mainly as foundation support elements to resist static and seismic loads, and to a lesser extent, as in-situ reinforcements to provide stabilization of slopes and excavations. Many of these applications are for transportation structures. This manual is intended to be a “practitioner-oriented” document containing sufficient information on the geotechnical and structural design of micropiles for foundation support and for slope stabilization. Information is also provided on inspection and load testing procedures, cost data, and contracting methods to facilitate the safe and cost-effective use of micropiles on transportation projects. Two detailed design examples and a generic commentary guideline specification for micropiles is included in the manual.