 The first section of modern MD 146 was constructed as a wide macadam road from York Road north in 1915.This road was resurfaced in concrete and extended to the southern edge of the Loch Raven Reservoir reservation just north of Seminary Road by 1921.The first portion of MD 146 north of Loch Raven Reservoir was a concrete road from the northern edge of the Loch Raven Reservoir reservation to MD 145 in Jacksonville built in 1928.