South Dakota Administrative Rules
Title 70 - Department of Transportation
Article 70:02 - Aeronautics
Chapter 70:02:04 - Airport licensing
Section 70:02:04:07 - Minimum requirements for nonrestricted licensing or approval of airports and landing fields

(1) Each end of the runway shall have a minimum unobstructed approach zone providing a glide angle of at least 20:1. This approach zone shall be trapezoidal in shape, beginning at a point 200 feet beyond the end of the runway and extending out 5,000 feet along the extended centerline. This zone is 250 feet wide at the inner edge and 1,250 feet wide at the outer edge. The approach zone shall have a minimum clearance of 15 feet over all highways, 17 feet over interstate highways and 23 feet over railroads;

(2) No objects shall penetrate the primary or transitional surfaces. The primary surface is a horizontal plane, 250 feet wide, 125 feet on either side of the landing area centerline and at the same elevation as the centerline. The transitional surface is an inclined plane with a slope of 7:1, being 7 feet horizontal for each one foot vertical, beginning at the outer edge of the primary surface and extending upward and outward;

(3) Runway lengths listed in subdivisions 70:02:04:07(5) to (7), inclusive must be increased for site elevation at the rate of 7 percent for each 1,000 feet of elevation above mean sea level; five tenths of one percent for each degree which the mean maximum temperature of the hottest month exceeds the standard temperature of 60 degrees Fahrenheit; and 20 percent for each one percent of effective gradient;

(4) The entire landing area must be suitable for safe operation of aircraft under normal weather conditions;

(5) Airports approved by the commission prior to August 25, 1964, shall have at least one serviceable landing area of 1,600 feet in length and 100 feet usable width;

(6) Airports approved between August 25, 1964, and July 24, 1974, inclusive, shall have at least one serviceable landing area 1,800 feet in length, 100 feet usable width;

(7) Airports established or requesting approval after July 24, 1974, shall have at least one serviceable runway 2,100 feet in length, 50 feet usable width. For landing fields or turf strips the length shall be increased by 400 feet after the necessary corrections have been added and the usable width increased to 100 feet.