§ 153.1069 CUL-DE-SACS.
   (A)   Generally. The city finds and determines that the use of cul-de-sacs and dead-end streets is inconsistent with the public policy of preserving an interconnected street system. Cul-de-sacs and dead-end streets do not promote street connectivity, and create inefficiencies in the distribution of traffic and water as well as inefficiencies and increased municipal expenses in the delivery of public services. In limited situations, cul-de-sacs can be used to avoid disturbing sensitive environmental features. In addition, there is a strong market demand for cul-de-sac lots in many communities. Accordingly, this section restricts the use of cul-de-sacs to appropriate situations and establishes standards for development that utilize cul-de-sac streets.
   (B)   Applicability. A cul-de-sac is a street, or a system of streets, having only one end open to traffic and the other end being permanently terminated and a vehicular turn-around provided. However, in situations where cul-de-sacs are permitted, they shall comply with this section. This section does not apply to a conservation subdivision use pattern. Cul-de-sacs are not permitted for the TND or TOD use patterns.
   (C)   Modification generally. An applicant seeking a modification from this section shall demonstrate that the strict application of subsection (B) above will produce unnecessary hardship as the result of extreme topographic conditions. For purposes of this section, the following shall be considered “extreme topographic conditions”:
      (1)   Slopes exceeding 20%;
      (2)   Marshes, wetlands, rivers, lakes, streams or ponds; and
      (3)   Areas within a critical area protected by Division 13 of this chapter.
   (D)   Right-of-way and pavement design.
      (1)   Cul-de-sacs and dead-end streets shall terminate in circular rights-of-way having a minimum pavement width radius of 45 feet for residential uses and 60 feet for commercial/industrial uses.
      (2)   In no event shall the cul-de-sac exceed the lengths established in Column (B) of Table 153.1069(A) below.
   (E)   Access restriction. The site plan or subdivision plat shall show a stub connecting the cul-de-sac to adjoining areas or parcels where future roadways are delineated in the thoroughfare plan or a recorded subdivision or site plan. The stub shall be improved as a pedestrian walkway, trail or bikeway.
   (F)   Landscaping.
      (1)   At least 40% of the bulb of the cul-de-sac shall be landscaped in accordance with the standards set forth in the standards for subdivision entrance landscaping (§§ 153.1190 and 153.1191 of this chapter).
      (2)   For cul-de-sacs with a radius exceeding 80 feet, at least 25 square feet of the area within the turnaround area shall be landscaped. (See Figure 153.1069(A) below.)
Table 153.1069(A): Cul-De-Sac Length (Maximum)
(A)
Zoning District
(B)
Maximum Cul-De-Sac/Dead-End Street Length (Feet)
Table 153.1069(A): Cul-De-Sac Length (Maximum)
(A)
Zoning District
(B)
Maximum Cul-De-Sac/Dead-End Street Length (Feet)
“RP” (Resource Protection)
600
“RE” (Residential Estate)
“NS” (Neighborhood Suburban)
150
“PD” (Planned Development)
“NU” (Neighborhood Urban)
75
“O” (Office)
50
“CN” (Commercial Neighborhood)
“CG” (Commercial General)
“CL” (Commercial Large-Scale)
“D” (Downtown)
“IL” (Industrial Light)
“IH” (Industrial Heavy)
“MX” (Mixed Use)
 
Figure 153.1069(A): Cul-de-sac Landscaping
(Ord. 3020, passed 9-10-2013, § 5.23.5)