Duthie’s XC trails are being built using a 7-step process:
1. Flag
2. Brush / Log
3. Bench
4. Fix flow
5. Fix drainage / finish bench
6. Add features and options
7. Finish
Source: Duthie 7 Steps on Evergreen’s excellent wiki.
Evergreen Mountain Bike Alliance, Washington State’s biigest MTB club, started building Duthie Park in 2008. Phase I officially opened summer of 2010. Read more about Duthie Hill.
P.S. Want to help them build more trails? Check out the work party schedule.