Enhanced rock weathering (ERW), such as spreading crushed basalt on agricultural land, is a promising approach to remove carbon dioxide as the rock dissolves. Yet field empirical evaluations on the pathways and rates at which ERW-derived solutes move through watersheds are still lacking. We implemented ERW at a 0.59-km² hay-and-pasture catchment in the Sleepers River Research Watershed, Vermont. In June 2023 we applied 20 t ha⁻¹ of basalt dust over 0.13 km² and monitored streamwater chemistry (for example Ca, Mg, bicarbonate/alkalinity) biweekly to monthly. Hydrological and statistical models that isolate treatment effects from natural variations revealed clear basalt signals: stream alkalinity rose by up to 500 µeq L⁻¹, and elemental ratios shifted toward those expected from silicate dissolution. Mixing analysis showed that most of the ERW-derived alkalinity travelled along rapid subsurface flow paths rather than slow groundwater routes, indicating a short lag between dissolution in soils and the observable export to the stream. These findings demonstrate that ERW can measurably enhance carbon removal at watershed scale and provide a framework for tracking its efficiency under real hydrological conditions.