Modern Lake Lahontan is a reservoir on the Carson River in northwest Nevada in the United States.

As no water rights have been allocated for recreation, the TCID could completely drain the lake to supply its irrigation customers.

A small settlement called "Lahontan" once stood near the reservoir, which in 1940 the Federal Writers' Project reported had a population of 25.

During the 2017 California floods, the highest inflow in history filled the lake, and a weir was made to handle outflow.

Oversized culverts were quickly put under US95 and lined with ripraps to let the water cross the road and protect Fallon from flooding.