§ 12-31. Minimum design standards for upgrading and new construction; exceptions.

(a)

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:

MINIMUM BRIDGE STANDARDS
FOR REPLACEMENT OR NEW BRIDGES BUILT ON COUNTY ROADS

Standard Number		1	2	3	4	5	6
			1,600	750	400	50	*0
Current ADT		Over	TO	TO	TO	TO	TO
		6,000	6,000	1,600	750	400	50

 

Terrain	F	R	M	F	R	M	F	R	M	F	R	M	F	R	M	F	R	M
Design Speed	50	40	30	50	40	30	50	40	30	50	40	30	50	40	30	50	40	30
Hydraulic Design	Variable
Capacity	(Based on cost risk analysis)
Design Loading	HS-20			HS-20			HS-20			HS-20			HS-20			HS-20
Bridge Width (Ft.)	64	54	54	40	30	30	28	28	28	28	28	28	24	24	24	24	24	24

 

*Standard Number 6 may be used on minor roads with few trucks.

Key:	F—Flat terrain
	R—Rolling terrain
	M—Mountainous terrain

 

(b)

Exceptions to these minimum standards are:

(1)

Bridges being routinely repaired.

(2)

Bridges that serve less than five (5) households on a dead-end road or non-thoroughfare.

(3)

Bridges providing limited access to agricultural fields, oil fields, or similar such areas.

(Ord. No. 89-26, Arts. 1, 2, 10-12-89)

Editor's note

Ord. No. 89-26, Arts. 1, 2, adopted Oct. 12, 1989, enacting minimum design standards for bridges on County roads, did not specify manner of codification; hence, such provisions have been included by the editor as § 12-31.