SC 30 appears 1996 Charleston County

SC 30 extended to US 17 2013 City of Charleston

Improvements: SC 30 was paved upon designation.
SC 30 was multilaned in all segments upon designation; SC 30 is a full freeway except for Calhoun St to US 17.
Comment: SC 30 provides an alternative routing to get from SC 171 and James Island to Downtown Charleston, utilizing a new Ashley River crossing that mars that side of the peninsula's view.
The freeway between Harbor View Drive and Calhoun St was opened as unnumbered freeway for a time prior to receiving the SC 30 designation.
SC 30 is actually the original planned end of I-526, if the 2 Stono River Bridges ever get built. As of this writing the plan had been scaled down to a non-interstate connection although the project was rejected in 2015 government action.

SC 30 Beaufort to St George 1922 Auto Trails

SC 30 projected to Santee 1924 Blue Book

In 1925 or 1926, SC 30 was extended north with SC 4 from Santee to Summerton, north as new primary routing to Sumter, replaced SC 42 north to Bishopville, east with SC 34 Lydia, then replaced SC 351 north to Hartsville (SC 30 may have briefly used today's S-16-52 and S-16-65), then northeast as new primary routing through Society Hill to Bennettsville, then replaced SC 38 northeast to North Carolina at McColl.

Pre-1926 Santee-Sumter-Hartsville-Bennettsville routings 1923 Auto Trails

SC 30 extended through Sumter, Hartsville, and Bennettsville 1926 Official

In 1927, SC 30 south was truncated to Walterboro. Walterboro to Pocotaligo became part of US 17 (now US 17 ALT and S-7-3) while the rest to Beaufort became part of SC 28 (now US 21).
In 1932, SC 30 was removed from today's S-16-366 and S-16-23 between Hartsville and Society Hill.
In 1933, SC 30 was renumbered as US 401. Today this is US 15 except it crossed what is now Lake Marion 2 bridges to the west of I-95 (has the billboards on them); S-42-5 in Sumter; S-43-46 and S-43-325 over Whites Mill Pond; US 15 Business through Hartsville; S-35-167 and abandoned causeway at the Pee Dee River; SC 385, SC 385 CONN through Bennettsville.

SC 30 truncated to Walterboro 1930 Official

SC 30 replaced by US 401 1933 Official

SC 30 replaced by US 401 1933 Official

SC 30 #2: Appeared in 1935 as a renumbering of SC 15 from US 221 Watts Mill to SC 92 near Cross Anchor.
About 1942, SC 30 was rebuilt in many places between US 221 and Tylersville, leaving behind abandoned alignments plus the lengthy Sandy Springs Rd.

SC 30 original routing 1940 Laurens County

SC 30 straightened out 1952 Laurens County

In 1947, SC 30 was rerouted on its north end to head east towards Cross Anchor, replacing SC 30 ALT. The old routing north to SC 92 became S-42-10.
In 1950, SC 30 was given a new crossing of the Enoree River west of the original, leaving behind Deerwood Dr and Big Loop Rd.

SC 30 northwest to SC 92 1940 Spartanburg County

SC 30 east to SC 92 1952 Spartanburg County

In 1956, SC 30 was renumbered as SC 49.

SC 15 northeast of Laurens 1932 Official

SC 30 Watts Mill to near Cross Anchor 1935 Official

SC 30 replaced by SC 49 1956 Official