§ 46-81. Bridges on county roads.

(a)

Standards in this section shall apply to upgrading, construction and erection of bridges on county roads.

(b)

Bridge specifications.

(1)

All major bridges constructed in the county on county roads will be constructed in accordance with state highway and transportation department specifications pertaining to H-20 loading specifications before they will be considered for inclusion into the county road system. The developer shall provide to the county judge or his designated agent certification by a registered engineer that the bridge meets referenced specifications.

(c)

The minimum bridge design standards for the upgrading of existing bridges and for the construction and erection of all replacement and new bridges on county roads shall be as follows:

Standard Number	1			2			3			4			5
Current ADT	Over 6,000			1,600 to 6,000			750 to 1,600			400 to 750			0 to 400
Terrain	F	R	M	F	R	M	F	R	M	F	R	M	F	R	M
Design Spread	50	40	30	50	40	30	50	40	30	50	40	30	50	40	30
Design Loading	HS-20			HS-20			HS-20			HS-20			HS-20
*Bridge Width (ft.)	40	32	32	40	30	30	32	28	28	28	28	24	24	24	24

 

*Railing required on all bridges.

F—flat
R—rolling
M—mountainous
ADT - Average Daily Traffic

(d)

The hydraulic design for bridges shall provide for the 25-year flood frequency. Freeboard will be based on the site-specific hydrology.

(e)

The exceptions to these minimum standards are:

(1)

Bridges being routinely repaired.

(2)

Bridges that serve less than three households on dead-end roads or nonthoroughfare roads.

(3)

Bridges providing limited access to agricultural fields, pasturelands, oil fields, timberlands, etc.

(f)

The upgrading of existing bridges and the construction and erection of replacement and new bridges on the county road system shall be subject to and meet the provisions as set forth in A.C.A. §§ 12-80-101—12-80-106 requiring earthquake-resistant design for public structures.

(Ord. No. O-13-55, § 1(Exh. A), 8-12-2013)