Dataset for the paper entitled ''Reconstructing past hydrology of eastern Canadian boreal catchments using clastic varved sediments and hydro-climatic modelling: 160 years of fluvial inflows''

The great depth of Grand Lake, the availability of fine sediments along its tributaries, and its important seasonal river inflow have favoured the formation of a 160 years-long clastic varved sequence. Each varve represents one hydrological year.

Varve formation is mainly related to spring discharge conditions with contributions from summer and autumn rainfall events. The statistically significant relation between varve parameters and the Naskaupi River discharge observations provided the opportunity to develop local hydrological reconstructions beyond the instrumental period. The combined detrital layer thickness and the particle size (99th percentile) series extracted from each varve yield the strongest correlations with instrumental data (r = 0.68 and 0.75) and have been used to reconstruct Naskaupi River mean and maximum annual discharges, respectively, over the 1856-2016 period.