Okla. Stat. tit. 62, § 62-82: Commissioner of Highways, interest on funds to credit of

All interest which shall be received by the State Treasurer upon

monies paid into the state depository, to the credit of the

Commissioner of Highways, by any county, to be expended for the

construction of bridges or highways, shall be credited to the fund

which shall earn the same; and all interest heretofore earned by any

such deposits or funds, and by the State Treasurer credited to the

general revenue fund, shall be transferred from said fund and

credited to the fund which earned said interest; Provided, there is

any unexpended balance of such fund to which to credit said

interest.