12.01.080 Variances.

A. The minimum design standards for public roads in Skamania County, as set forth in Section 12.01.030, shall apply uniformly to all future applications for public road approvals; provided, that wherever, in the opinion of the board of county commissioners, special circumstances require that the standards must be exceeded or lowered, the commissioners may raise or lower the standards after first setting the matter for public hearing and, if after the public hearing the commissioners find either (1) that the existing standards will not adequately protect the general public and therefore must be raised; or (2) that the application of the existing standards would result in an undue hardship to the applicant or the environment; or (3) that to require the application of the minimal standards would deprive the subject property of rights and privileges given other properties in the area; and, in addition to making one of the above findings the commissioners find that granting the variance will not unduly adversely affect the general public or, with respect to raising standards, that the raising of the standards are necessary for the protection of the general public.
B. Appeal: Any person aggrieved by a decision of the board may appeal said decision pursuant to and in the manner provided by the Washington Administrative Procedures Act. (Ord. 1981-05 (part))

Table 12.01.030

ADT	Access		Collector 250		Arterial 500
Design Hourly Volume (DHV) 15 years hence	0--100		100--200		200--+
Design Speed mph	Min. 25 mph	Desirable 30 mph	Min. 30 mph	Desirable 35 mph	Min. 35 mph	Desirable 50 mph
Sharpest Curve Radius in ft.	Min. 150	Desirable 250	Min. 250	Desirable 350	Min. 350	Desirable 700
Gradient in %		Max. 12%		Max 10%		Max 8%
Pavement Width*	Min. 20	Desirable 22	Min. 22	Desirable 24	Min. 24	Desirable 24
Width of Roadbed	26	30	30	34	34	40
Number of Lanes	2	2	2	2	2	2
Stopping Sight Distance**	Min. 160	Desirable 240	Min. 200	Desirable 275	Min. 240	Desirable 350
New Bridges Roadway Width Design Loan (AASHTO) Vertical Clearance	26 HS 20-44 16.5		30 HS 20-44 16.5		34 HS 20-44 16.5
Right-of-way Width	60		60		60
Structural Design* Base Thickness Base Type** Surfacing Type	6" Crushed Bitumin.		9" Crushed Bitumin.		12" Crushed ACP

* Driving surface of all new arterial roads must have an asphalt concrete finished surface before acceptance into the county system; provided, that provisions for bonding may be substituted for asphalt surfacing for a period not to exceed eighteen months. All other road classes must have a bituminous surfacing before county acceptance.

**** Basic materials shall conform to the applicable WSDOT Standard Specifications. Maximum rate of grade shall not exceed twelve percent within a three-hundred-foot radius curve, ten percent within a two-hundred-foot-radius curve. For all curves having radius shorter than three hundred feet, maximum rate of grade shall not exceed the above proportional limits.
Curves with a radius of less than five hundred feet shall be widened according to A.A.S.H.O. formulas for widening on curves.