170.11 DESIGN STANDARDS — STREETS.

   1.   General Considerations that must comply with the current Iowa Statewide Urban Design Standards for Public Improvements (“SUDAS”).

      A.   The street and alley layout shall provide access to all lots and parcels of land within the subdivision.

      B.   Street jogs of less than 150 feet shall be avoided.

      C.   Cul-de-sacs shall not exceed 700 feet in length.

      D.   New subdivisions shall make provisions for continuation and extension of thoroughfares and collector streets and roads.

      E.   No dead-end streets will be permitted except at subdivision boundaries and in no event shall any dead-end street be in excess of 500 feet.

      F.   Thoroughfare and collector streets in a subdivision shall extend through to the boundaries thereof, unless a terminal point within the subdivision is shown in the master street plan.

      G.   Alleys shall be discouraged in residential areas but shall be provided in commercial and industrial areas unless other suitable public or private access to loading and service areas is provided.

      H.   Intersection of road centerlines shall be between 80 degrees and 100 degrees.

      I.   Intersection of more than two streets at a point shall not be permitted.

      J.   Where parkways or special types of streets are proposed, the Commission may apply special standards for the design of such parkways or streets.

      K.   Proposed streets that are extensions of or in alignment with existing streets shall bear the name of the existing street. Names of new streets shall avoid duplication of or similarity to existing names of streets, or public and semi-public buildings and areas.

L.   Streets, avenues, places and courts shall be named in the following manner:

 

General Direction	Long Streets	Short Streets
north and south	streets	courts
east and west	avenues	places
diagonal	roads	ways
curving	drives	lanes

 

2.   Minimum rights-of-way shall be provided as follows:

      A.   Thoroughfares - 100 feet. In addition, access spacing on thoroughfares is as follows: (i) intersection spacing – 600 foot minimum; (ii) entrance spacing – 300 foot minimum; (iii) separation of entrance from intersection – 150 foot minimum.

      B.   Residential collector streets - 70 feet.

      C.   Commercial collector streets - 80 feet.

      D.   Residential streets - 60 feet.

      E.   Cul-de-sacs - 110 feet in diameter.

      F.   Alleys - 20 feet.

   3.   The minimum width of surfacing to be provided shall be as follows:

      A.   Reserved.

      B.   Reserved.

      C.   Commercial collector streets:

         (1)   Parallel parking - 49 feet.

         (2)   Angle parking - 61 feet.

      D.   Residential street - 25 feet or 31 feet within the discretion of the Council.

      E.   Cul-de-sacs - 85 feet in diameter.

      F.   Alleys - 20 feet.

      G.   Sidewalks - 4 feet.  

   4.   Grades. No street grade shall be less than one-half of one percent and shall not exceed the following limits:

      A.   Thoroughfare streets - 4 percent.

      B.   Collector streets - 6 percent.

      C.   Residential streets - 8 percent.