Tonasket City Zoning Code

The AI district is intended to ensure that land uses at and surrounding the city of Tonasket Municipal Airport and adjoining city-owned property recognizes the priority nature of aviation in the area. The district is intended to provide a basis for implementation of the comprehensive plan airport industrial designation and Federal Aviation Administration and Washington State Department of Transportation regulations and guidelines for general aviation facilities.

In an AI district uses and their accessory uses are permitted as listed in Table 1 – District Use Chart, TMC § 17.70.020.

In an AI district lot size, width, bulk, height and density standards are listed in Table 2, TMC § 17.70.080, and height limitations of TMC § 17.60.070.

A noninstrument approach surface is established at each end of all noninstrument runways for aircraft landing and takeoff. The elevation of the runway at the Tonasket airport is 1,311 feet MSL. The inner width of the approach surface is 250 feet at its line of origination at the runway threshold, and it expands uniformly to a width of 1,250 feet at a horizontal distance of 5,280 feet from the runway threshold. This approach surface is at ground level for a distance of 200 feet from the runway threshold, and thereafter it extends upward at a slope of 20 to one. The elevation of the inner width of the approach surface is the same as the elevation of the primary datum.

The transitional surfaces extend outward and upward for a horizontal distance of 5,280 feet at right angles to the runway centerline, and extend upward at a slope of seven to one from a line located 100 feet from, and parallel to, the runway centerline, except that where the transition surface would come within 150 feet of the ground in high terrain located east or west of the runway, the minimum height of the transition surface shall be 150 feet above the ground. The transition overlay district is bounded on either side by a turning overlay district. The elevation of the line 100 feet from the runway centerline is the same as the elevation of the primary datum.

The turning surfaces extend outward and upward from the runway at a point located in the center of the threshold. Each turning overlay district is bounded by the surfaces of the approach overlay district and the transitional overlay district, and an arc with radius of 5,280 feet that is subtended from a point located at the center of the runway threshold.

Except as otherwise provided in this chapter, no structure or tree shall be erected, altered, allowed to grow or be maintained so as to penetrate into any overlay district created in this chapter as described in TMC § 17.60.040 through § 17.60.060. Uses of the underlying lands that create dust, glare, or concentrations of birds that affect the use of the overlay district shall be considered violations of the height limitations set forth herein.

Where there exists a conflict between any of the regulations or limitations prescribed in this chapter and any other regulations applicable to the same areas, whether the conflict is with respect to the height of structures or trees, the use of land or any other matter, the more stringent limitations or requirements shall prevail.