Chapter 25 SUBDIVISIONS*
Section 25-42 Street improvements generally.
Streets and curbs and gutters shall be improved to comply with the standards
and in the city street and storm sewer specifications and design standards, and all design
standards and specifications now or hereafter promulgated by the director of public works or
adopted by the council, in accordance with the final construction plans required to be approved
prior to final plat approval.
(1) Responsibility for improvements costs. It
is the policy of the city to participate in or
contribute only to certain additional costs of construction of major thoroughfares over and above
the normal costs of local standard streets, when streets are designated at higher standards by the
city. Such participation, and its timing, is not mandated and is solely at the election of the
council, according to the needs of the community.
(2) Arrangement. All
shall be located properly with respect to extending existing and
platted streets, to traffic generators, to population densities, and to the pattern of existing and
proposed land uses.
Local streets shall be designed to provide convenient and safe access to all properties
and to permit efficient drainage and utility systems. The use of through streets shall be
encouraged to connect adjoining areas and to facilitate the delivery of public and emergency
services; however, straight streets more than 800 feet long shall be avoided to discourage
speeding. Individual local residential street segments should serve no more than 50 dwelling
units without additional street connections. Local streets with connections to arterial and
collector streets shall be designed to avoid cut-through traffic. Curvilinear streets are encouraged
to minimize speeding and the amount of grading. Cul-de-sacs and loop (U-shaped) streets should
be short in length, less prevalent than through streets, and may be especially appropriate to avoid
steep slopes, major creeks, floodplains, wetlands and other sensitive environmental areas.
street connectivity index (consisting of the number of intersections divided by the combined
number of intersections and cul-de-sacs) shall be calculated for proposed new subdivisions.
b. Where a subdivision abuts
or contains an existing arterial street or highway having
limited access, the commission may require the arrangement of residential lots with rear yards
abutting the major street, or the provision of frontage roads, or other such treatment as may be
necessary in order to provide for adequate protection of residential properties, to afford
separation of through and local traffic, and to provide for suitable access to the property
Interconnection of adjacent subdivisions with compatible land uses shall be encouraged.
When a new subdivision adjoins unplatted or undeveloped land, the new streets shall be carried
to the boundaries of such land unless vehicular access is unnecessary or inappropriate. A
temporary turnaround approved by the director of public works shall be installed at this point,
except when the terminus of the street is less than three hundred (300) feet from an intersecting
street right-of-way. Where street connections to adjoining land are not provided and there is
need for non-vehicular public access to a school, park, trail or other area or use, the city may
require the dedication and improvement of a green space access easement or green space trail
easement. Whenever such public improvements are required and the landowner conveys fee title
in lieu of an easement, the city shall accept ownership and maintenance.
Private drives may be allowed only to provide internal circulation within a single lot or
parcel, except when approved in conjunction with a planned district.
(3) Blocks. Streets should generally intersect
at intervals not exceeding one thousand (1,000)
feet or less than four hundred (400) feet. Blocks shall have sufficient depth to provide for two (2)
tiers of lots of appropriate depth. Exceptions to this prescribed block depth shall be encouraged
in blocks adjacent to major streets, railroads or waterways.
(Code 1964, § 19.544(1); Ord. No. 10099, § 1, 3-5-84; Ord. No. 15847, § 1, 1-5-99; Ord.
17228, § 1, 3-18-02; Ord. No. 018097, § 1, 6-7-04)
(Ord. 018097, Amended, 06/07/2004, Prior Text; Ord. 17228, Amended, 03/18/2002, Prior Text; 15847, Amended, 01/04/1999, Prior Text)