11-7-9: IMPROVEMENT STANDARDS:

   A.   Road Construction Standards: All roads shall meet the following standards and standards contained in appendix A adopted by reference in section 11-15-1 of this title. Any deviation from these standards must be designed by a licensed engineer and approved by the city engineer and the public works department.

TABLE 1
STREET DESIGN STANDARDS

	Major/Minor Collectors		Minor Roads
Terrain1	Ordinary	Mountainous	Ordinary	Mountainous
Right of way width	60 to 100 feet	-	60 feet	-
Centerline radius on curves	300 feet	-	150 feet	-
Tangent length between reverse curves	100 feet	-	50 feet	-
Stopping sight distance	300 feet	-	200 feet	-
Angle of intersecting centerlines	75 degrees	-	75 degrees	-
Curb radius at intersections	25 feet	-	15 feet	-
Length of cul-de-sac	-	-	1,000 feet2	-
Outside radius on cul-de-sac ROW	-	-	50 feet	-
Grade, maximum	7 percent	-	10 percent3	-
Grade, minimum	0.5 percent	-	0.5 percent	-
Maximum grade within 150 feet of intersecting centerlines	3 percent	-	-	-
Maximum grade within 75 feet of intersecting lines	-	-	3 percent	-

 

Notes:

All standards are minimum standards unless noted.

   1.   "Mountain terrain" is defined as terrain that has a cross slope exceeding 15 percent.

   2.   Cul-de-sac roads that provide access to unsubdivided land may exceed this length.

   3.   Grades of over 10 percent shall not exceed 100 feet in length.

TABLE 2
PAVING AND STREET WIDTH STANDARDS

Average Daily Trips		Finished Gravel Width	Paving Width
Nonmountainous terrain:
	8	-	28 feet
	16	-	28 feet
	24	-	28 feet
	32to99	-	28 feet
	100+	-	28 feet
Major collectors and arterials		-	As approved by the council

 

   B.   Road Signs: Road signs of the size, shape, and height as approved by the public works department, shall be placed at all intersections by the subdivider.

   C.   Road Sign Standards: Location of road signs shall be designated on road plans, which are submitted for review and approval.

      1.   Posts: See the city specifications (design standards and specifications adopted by reference in section 11-15-1 of this title).

      2.   Signs: See the city specifications (design standards and specifications adopted by reference in section 11-15-1 of this title). (Ord. 2004-1, 4-5-2004)