On the application of any person interested, the board of supervisors may by ordinance declare all or any portion of any slough, river, or stream to be a public highway for the purpose of fishing therein, if it:

From the time the ordinance becomes effective, the slough, river, or stream is a public highway for such purpose, subject only to the reservations contained in this article.

If any owner of land adjacent to or across which the slough, river, or stream declared to be a highway for fishing flows does not consent to its use for such purpose with the right to pass along the banks for the purpose of fishing and on application refuses to grant the right of passage to the county by suitable instrument in writing, the board may contract for and purchase any such rights.

If the right of passage cannot be purchased at a satisfactory price, the board may authorize condemnation proceedings to be commenced to procure the right.