SC 46 ALT: Appeared 1939 as a renumbering of SC 33 ALT, running from SC 46 (now S-7-13) Bluffton south to the nearby May River waterfront.
It appears that SC 46 ALT was extended west as a loop back to SC 46 via Bridge St and Heyward St by 1942.
In 1947, SC 46 ALT was downgraded to S-7-11 (now S-7-66) and S-7-31.