The Arizona Geological Survey (AZGS) has released a preliminary report about the landslide that closed SR 87 between Phoenix and Payson last March. It's a short and informative report with some interesting findings - most notably the identification of 4 paleo-landslides in the area, and that part of one of those was reactivated to cause the road closure.
While it's still preliminary, we have scheduled the Aecom (formerly DMJM Harris) team to give us a presentation about the remediation of this landslide for our meeting on May 7, 2009.
"Reconnaissance Report on the Easter Weekend Landslide of 21 March 2008, SR-87, Gila County, Arizona." by M. Diaz, B. Gootee and A. Youberg