The Lena River's water flow, sediment load, and heat flux have changed significantly in the past few decades due to climate factors. The lower reaches of the river show increased water runoff, sediment yield, and heat flux, with the most significant changes observed since the late 1980s. The construction of reservoirs had minimal impact on water resources but disrupted natural winter low water conditions. Different branches of the river delta have varying percentages of water runoff. Overall, the river's hydrological patterns have shifted over time, with notable increases in water flow and sediment load.