In fall 2005, the Presidio Trust restored an approximately 150 m reach of Tennessee Hollow, a perennial stream draining into the restored Crissy Field wetland.  This reach, informally known as Thomson Reach, was formerly contained in a culvert buried under a landfill.  Excavation and removal of the landfill provided an opportunity to restore a surface stream and plan a riparian corridor.  The completed creek daylighting effort resulted in excavation of approximately 3 acres, removal of about 33,000 cubic yards of fill contaminated with mercury and PCBs, planting of approximately 2 acres of native vegetation, and construction of a restored creek channel.  One of the driving goals of the restoration project was to increase ecosystem habitat. Many of the current design methodologies and tools available to the restoration community have a high degree of uncertainty associated with them, which can result in undesirable project performance or even overall project failure unless appropriate actions are taken prior to project implementation (proactive measures) and/or an effective monitoring program is implemented and an adaptive management approach is embraced (interactive measures).  Our study analyzed the impact of uncertainties associated with the ecosystem design for the establishment of macroinvertebrates within the restoration project.