High intensity precipitation (HIP) events can lead to flooding in urban areas with extensive impervious surface cover and compacted soils. The total or directly connected impervious area of a watershed is often used to estimate the runoff response or quickflow component of storm events. However, this conceptual approach ignores the potential for compacted urban soils to generate overland flow during HIP. Empirical data on the hydraulic properties of urban soils are needed to estimate their contribution to overland flow across a range of storm events. This study was conducted in the 62 km2 urban Black Creek watershed in Toronto, Canada. Field-saturated hydraulic conductivity (Kfs) was measured in parks (n = 61) and roadside patches (n = 12) using a dual-head infiltrometer. Macropore flow was estimated as the difference between Kfs and the results from a simplified tension infiltrometer. Hourly precipitation data were compared with Kfs to estimate the likelihood of overland flow. Bulk densities ranged from 0.97-1.62 g cm-1, suggesting only moderate compaction at the high end. The results indicated that infiltration was dominated by macropore flow, which could explain the weak correlation between Kfs and bulk density. Mean Kfs values for parks (321 mm h-1) and roadsides (175 mm h-1) were approximately 2-4 times greater than the maximum precipitation intensity. These results suggest that, despite heavy human use, urban soils within the Black Creek watershed are unlikely to contribute to overland flow during HIP events. Accordingly, these soils should be preserved as an important component of Toronto’s stormwater management.