 The paved road was extended east from Sweet Air to Bradshaw, including what is now MD 165 south of MD 145, between 1924 and 1927.MD 145 was extended west to MD 45 around 1983 when Paper Mill Road and Ashland Road through the reservoir area were transferred from city to state maintenance.Bridges have crossed Gunpowder Falls at the site of MD 145's modern crossing since at least the 1770s.