The AOZD is composed of several height limitation zones, which include all land lying beneath the approach surfaces, transitional surfaces, horizontal surfaces, and conical surfaces appurtenant to Stanford Field and the Henry's Lake Airfield. These zones are shown on supplements to the official zoning map of the city. An area located in more than one of these zones is considered to be only in the zone with the more restrictive height limitation.

1. Utility Runway Visual Approach Zone. The inner edge of the approach zone coincides with the width of the primary surface and is two hundred fifty feet wide. The approach zone expands outward uniformly to a width of one thousand two hundred fifty feet at a horizontal distance of five thousand feet from the primary surface. Its centerline is the continuation of the centerline of the runway.
   
2. Transitional Zones. The transitional zones are the areas beneath the transitional surfaces.
   
3. Horizontal Zone. The horizontal zone is established by swinging arcs of five thousand feet from the center of each end of the primary surface of each runway and connecting the adjacent arcs by drawing lines tangent to those arcs. The horizontal zone does not include the approach and transitional zones.
   
4. Conical Zone. The conical zone is the area that commences at the periphery of the horizontal zone and extends outward there from a horizontal distance of four thousand feet.
   

(Ord. No. 2015-01, § 2, 2-26-2015)

No structure or tree shall be allowed to exceed the height limitations established here.

1. Utility Runway Visual Approach Zone. Slopes twenty feet outward for each foot upward beginning at the end of and at the same elevation as the primary surface and extending to a horizontal distance of five thousand feet along the extended runway centerline.
   
2. Transitional Zones. Slope seven feet outward for each foot upward beginning at the sides of and at the same elevation as the primary surface and the approach surface, and extending to a height of one hundred fifty feet above the airport elevation. In addition, there are transitional sloping seven feet outward for each foot upward beginning at the sides of and at the same elevation as the approach surface, and extending to where they intersect the conical surface.
   
3. Horizontal Zone. One hundred fifty feet above the airport elevation.
   
4. Conical Zone. Slopes twenty feet outward for each foot upward beginning at the edge of the horizontal zone and at one hundred fifty feet above the airport elevation, and extending to a height of three hundred fifty feet above the airport elevation.
   
5. Exception from Height Limitations. Nothing in this title shall prohibit the construction or maintenance of any structure of thirty feet or less in height, or the growth of any tree to a height up to thirty feet above the surface of the land within the horizontal and conical zones.
   

(Ord. No. 2015-01, § 2, 2-26-2015)

Permit requirements for all application activity are established in Chapter 17.03 SAMC. Within the AOZD, permit requirements shall be expanded to include the planting of any tree with a growth habit of more than thirty feet and the construction of any building or structure that is more than thirty feet in height and is exempted from the requirement for a permit. This includes agricultural outbuildings and similar accessory structures, except as follows:

1. Within the horizontal and conical zones: No permit shall be required for trees with a growth habit of less than thirty feet, or for exempt structures of less than thirty feet in height, except when, because of topographic features, such a tree or structure would extend above the height limits for those zones;
   
2. Within the approach zones, but at a horizontal distance of not less than four thousand two hundred feet from each end of the runway: No permit shall be required for trees with a growth habit of less than thirty feet, or for exempt structures of less than thirty feet in height, except when, because of topographic features, such a tree or structure would extend above the height limits for those zones; and
   
3. In the areas lying within the limits of the transition zones, but beyond the perimeter of the horizontal zone: No permit shall be required for trees with a growth habit of less than thirty feet, or for exempt structures of less than thirty feet in height, except when, because of topographic features, such a tree or structure would extend above the height limits for those zones.
   

(Ord. No. 2015-01, § 2, 2-26-2015)

Nonconforming uses and buildings are regulated by these provisions within the AOZD, according to these requirements in addition to those of Sections 17.10.030 SAMC —17.10.040 SAMC.

1. Nonconforming uses within the AOZD, may include trees, and shall be required to permit the installation, operation, and maintenance of any markers and/or lights the city or airport board deems necessary to indicate their presence to the operators of aircraft. Such markers and lights shall be installed, operated, and maintained at the expense of the city or airport board.
   
2. The repair and, under specified circumstances, replacement of nonconforming uses and buildings permitted by this title, including any building, or tree shall not be permitted to become a greater hazard to air navigation than it was on the effective date of the ordinance from which this chapter was derived.
   

(Ord. No. 2015-01, § 2, 2-26-2015)