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The Montana State Fairgrounds Racetrack, also known as the Lewis and Clark County Fairgrounds Racetrack and as Helena Downs, is a historic horse racing track located on the outskirts of Helena, Montana, in the United States. Constructed in 1870, the track was part of the Montana State Fairgrounds, now the Lewis and Clark County Fairgrounds. The racetrack was added to the National Register of Historic Places on December 20, 2006. Portions of the track were demolished from 2006 to 2008 due to new construction on the fairgrounds.