WV 54: 0 - 0
Raleigh-Wyoming Line: 3.2 - 3.2
WV 54, WV 97: 10.5 - 13.7
WV 16, WV 97: 0.3 - 14.0
Creation: Appeared about 2005 as new construction running as it does today. This is the only WV 121.
Adjustments: WV 121's extension to WV 54 near Mullens was graded by 2017 but not paved to just inside Wyoming County and was not open to traffic.
In Oct 2020 (aaroads forum), WV 121 was extended south to WV 54 near Mullens.
Improvements: Upon designation, WV 121 was fully paved and a 4-lane expressway.
Comment: WV 121 is the Coalfields Expressway, a road that is intended to reach Welch and extend west into Virginia before ending at US 23 Pound VA.
WV 121 is the placeholder designation for US 121 which will be assigned to the Coalfield Expressway at some point (my guess would be this might take place when the road reaches US 52 Welch OR if Virginia builds its segment from US 23 to US 460 first.
No matter who does what first, the Coalfields Expressway is a long, long way from being fully finished in West Virginia. The only other parts that have had any work are:
a 1-mile segment behind the McDowell Federal Correctional Center has been graded but not paved.
In 2022 construction has begun on a segment from CR 7 Welch northeast to WV 16. This will leave a gap to Mullens.
WV 121's open segment
2017 Raleigh County