The board of supervisors of any county now controlling or maintaining, by virtue of any statute, any bridge across any navigable stream, which bridge is wholly or in part within any city, may whenever necessary:
(a)
Reconstruct all or any part of such bridge.
(b)
Replace such bridge by a new structure.
(c)
With the consent of the governing body of such city, change the location of such bridge to a location on the stream better suited to the use of the bridge or to the use of the navigable stream. The board of supervisors may abandon any such existing bridge and build a new bridge at such changed location.