Large woody debris (LWD) and complex three-dimensional logjams play a critical role in creating and maintaining habitat diversity for aquatic organisms, particularly insects and fish. Considerable research has explored the mechanisms by which logjams produce habitat complexity in rivers and streams as well as how that complexity influences aquatic community structure, function, and biodiversity. Beyond simply producing logjam-associated habitat (LAH), however, logjams expand the stream-landscape interface across three dimensions and may themselves serve as important hot-spots for species interaction. We suggest a shift toward a more expansive view of logjams and LWD from passive stream “structure” to active stream “infrastructure” that directly facilitates and influences the behavior and ecology of a wide range of organisms. In this study, we will assess how LWD and logjams themselves influence community dynamics in Big Creek, a 6th-order wilderness stream in central Idaho. After a series of moderate-to-high-intensity wildfires, a 2014 avalanche deposited thousands of standing dead trees into the river corridor, creating a dynamic mega-logjam that, despite varying degrees of fragmentation and downstream redistribution, is strongly influencing habitat patterns more than a decade later. Rather than an anomaly, research suggests that such events were historically the norm in mountain streams of the American West. In this study, we will assess the relationship between logjam topological characteristics (e.g., distribution, density, persistence) and biodiversity metrics. We will use various methods—camera traps, track plates, snorkeling, and visual observations—to catalog the aquatic and terrestrial organisms associated with logjams. We will assess logjam morphology and dynamics through satellite imagery, historical photos, and in situ measurements. Finally, we will examine the effect of logjams on aquatic-terrestrial food web linkages by comparing the flux of aquatic invertebrates to terrestrial predators (e.g., birds, bats) and terrestrial prey to aquatic predators (e.g., fish) at logjam, no-logjam, and logjam-associated sites.