W. Va. Code § 17-4-26
The state road commissioner may, at any time, after due consultation with and notice to the governing body of the municipal corporation, locate and designate or relocate and redesignate, as a connecting part of the state road system, any bridge or street within a municipal corporation. The commissioner may construct, reconstruct, improve and maintain the designated or redesignated connecting part at the cost and expense of the state.
Any existins free bridge forming a connecting link between two counties or two state routes is hereby adopted as part of the state road system and shall hereafter be maintained by the state, and any existing free bridge forming a connecting link between this and another state is hereby adopted as part of such system, and shall, as to that part of the bridge within the boundary of this state, be maintained by the state.
W. Va. Code § 17-4-26