Micropiles are small diameter piles that are constructed by drilling and grouting techniques. Micropiles are a foundation alternative that are cost-effective in a variety of conditions encountered in Montana Department of Transportation (MDT) projects. While the technology was first introduced in the US in 1973, MDT’s experience with micropiles is limited. A limited experience base has led to underutilization of a potentially beneficial foundation alternative. In particular, the objective of this research project was to gain knowledge of the state-of-practice in neighboring western state transportation agencies regarding the use of micropiles for foundation support and earthen slope repair. This objective has been met by developing, conducting and compiling the results of a survey given to neighboring western state transportation agencies on the use of engineered micropiles.


Final Report

Special Provisions

WA - 2010
WA - 2012
WY Blue Tail Slide
WY - Bret and Upper Shell Slides
WY - Double Nickel Slide

WSDOT Documents

George Staller Bridge Contract Documents
George Stellar Contract Plans
Micropile Bid Tabs
Portland Road to Tacoma Road Contract Documents
Portland Road to Tacoma Contract Plans
Standard Specifications for Road, Bridge, and Municipal Construction - 2014
Yesler Way Contract Documents
Yesler Way Contract Plans