Okla. Stat. tit. 69, § 69-606: Bridges between adjoining counties

The board of county commissioners of any two or more adjoining

counties may unite in the construction of a bridge, or bridges, over

any stream forming the boundary line between such counties or

flowing from one county into the other, and the said bridge, or

bridges, may be located by them at any point or points on the stream

not more than two (2) miles from the boundary line of the counties.

If the board of county commissioners of each county so situated

finds that a bridge across the stream is necessary and approves its

construction, it shall be the duty of the boards of county

commissioners, and each of them, to at once proceed with the

construction of the bridge. Such counties shall bear the cost of

the construction of the bridge, or bridges as agreed by said

counties; such construction shall be under the supervision of the

boards of county commissioners, which boards shall act in

conjunction in such construction; and the bridge, when so

constructed, shall remain the property of such counties,

respectively, and shall be jointly maintained by such counties.