Climate change has led to a higher frequency of heavy precipitation events in isolated areas. In both 2016 and 2018, the watersheds of several tributaries to Lake Superior received the majority of their annual rainfall totals in single storm events. As a result, a large flush of phosphorus and sediment were exported from these streams into the nearshore waters of Lake Superior. The two storms were isolated spatially such that neighboring watersheds were unimpacted by the heavy rainfall. We analyzed total phosphorus (TP) and suspended sediment export from multiple streams along Lake Superior’s southern shore in Northwest Wisconsin (USA) from 2014 to 2021 using a combination of field measurements and modeled estimates. In addition, we analyzed the proportion of the TP load that was bioavailable as soluble reactive phosphorus (SRP). Our initial results suggest that annual TP and sediment export were 2- to 6-times higher in 2016 and 2018 than the seven-year median. In contrast, TP and sediment export in the neighboring watersheds unimpacted by the storm did not deviate from the median in either year. Given the predominance of clay soils in the study watersheds, only a small fraction of phosphorus was exported as SRP. Our study suggests that the episodic and isolated nature of heavy precipitation events will lead to significant yet unpredictable pulses of nutrients and sediment from stream ecosystems.