Iredell Co.: N.C. 150 is the only road of any sort that crosses Lake Norman. Hits I-77 at exit 36. There's a grade separation bewteen 150 and U.S. 21, where a short two-lane road is used to get from one highway to the other. Goes around Mooresville to the north. 

Rowan Co.: Goes through Salisbury along Main Street and crosses the Yadkin River. Co-signed with U.S. 29/70 through this stretch. 

Forsyth Co.: Winston-Salem (Peters Creek Parkway, Green 40); Kernersville (Bodenhamer Street, Oak Ridge Road)

By 1931 (perhaps in 1930), 150 was extended west through Mooresville to Lincolnton all the way to U.S. 74 (old N.C. 20; today this road is Business 74) near Shelby. The highway between Lincolnton and Shelby had previously been denoted N.C. 206. 

In late 1939 or early 1940, today's 150 formed. 150 was extended north to its current terminus at U.S. 158. It was signed over U.S. 29/52/70, between Salisbury and the north bank of the Yadkin River. From the Yadkin River all the way to U.S. 158 it superseded N.C. 703. 
150 was also extended into South Carolina, over 

In the late 1950s, N.C. 150 was rerouted around the north of Mooresville. The original 150 through the center of town was renumbered as an extension of N.C. 152. 

In the mid-1990s, a new, four-lane 150 was built around the east and south of Shelby. The old 150 through the center of Shelby had already been co-signed with Business 74 and N.C. 18, so no new designations were needed. 

Alignment I. Upon replacing N.C. 703 through W-S around 1940, 150 was originally signed over: 

 Alignment II. New roads were built in the late 1950s, and by 1960 150's routing became: 

Alignment III. In 1994, 150 obtained its current routing. The route was sent further north along the Peters Creek Parkway and along Green 40 all the way past Kernersville. In addition to these changes through W-S, 150 was rerouted in the Kernersville area. Previously it had gone through the center of Kernersville over Main Street and Oak Ridge Road. Nowadays it stays on Green 40 (U.S. 421) to Bodenhamer Street (N.C. 66), and skirts the east side of town before continuing north on Oak Ridge. Phew.

The first 151 was a spur from the original N.C. 15 (U.S. 29). It followed today's U.S. 601 from Concord south through Monroe and into South Carolina, and was designated around 1926 (definitely by 1927). See the map at the top of the page. In 1949 or 1950, 151 was superseded by 601 when the U.S. highway was extended southward from its old terminus in Salisbury. 

For several years afterward, 151 went unassigned. Today's 151 got its number around 1962, when the Parkway was completed in the Mt. Pisgah area. It used to be N.C. 112.

151 essentially serves as an access road to Mt. Pisgah (right). The road, along with U.S. 276 to the south of Pisgah, shows up on 1920s maps. Although the road hasn't been called 151 for all that time, it predates the Parkway by several decades.

Today, 152 touches N.C. 150 twice: once at it its western terminus on the west side of Mooresville, and again on the east side of Mooresville. Originally, however, it was 150 and not 152 that went through the center of Mooresville; 152 ended at 150 to the east of town. Around 1959, a new 150 was signed around the north of Mooresville, and 152 was extended along 150's old route to its current western terminus.