Okla. Stat. tit. 69, § 69-633: Plans and specifications - Letting contract - Building by

county board - Advisory services - Warrants for payroll.

A. When any culvert or bridge is to be constructed at an

estimated cost of Three Hundred Thousand Dollars ($300,000.00) or

more, or any culvert or bridge reconstruction is to be accomplished

at an estimated cost of Three Hundred Thousand Dollars ($300,000.00)

or more, or grade-and-drainage project is to be developed, or

reconstruction, replacement or major repairs are to be accomplished

by the board of county commissioners acting alone or in cooperation

with the state or federal government, at an estimated cost of Eight

Hundred Thousand Dollars ($800,000.00) or more, in either event,

engineering plans and specifications shall be prepared by the county

engineer to ensure sound engineering practices. The project shall

be advertised for bids pursuant to Section 1101 of this title, and

the contract shall be let only after notice at a public letting. If

the construction work can be completed for a cost below or equal to

the estimate of the engineer or below any bid submitted at a public

letting and so entered in its journal, nothing in this title shall

prevent the board from causing the same to be built by day labor,

force account, and purchase by the county of materials as provided

by law.

B. If the board of county commissioners deems it necessary, it

may consult and seek the advice of the Department of Transportation

regarding the design, construction and maintenance of the project,

and the Department of Transportation may furnish advice for any of

the projects to ensure sound engineering practices. If provided,

the services shall be furnished without cost or expense to the

county.

C. The board may authorize the county clerk to draw warrants

for the amount of payrolls for labor furnished under the day labor

system, when the payrolls are certified to as correct by the

engineer or person in charge of the work, and the payroll shall be

passed upon by the board following certification.