1983-47 Establishing Standards for Road ImprovementsSections:
KODIAK ISLAND BOROUGH
ORDINANCE N0. 83 -47 -0 (A)
AN ORDINANCE OF THE KODIAK ISLAND BOROUGH ASSEMBLY ESTABLISHING
STANDARDS FOR ROAD IMPROVEMENTS.
The Kodiak Island Borough Assembly hereby ordains that:
Section 1. Chapter 16.26, Standards For Road Improvements, is created to read
as follows:
Cha ter 16.26
Standards or oa mprovements
16.26.010 General requirements.
16.26.015 Road classifications.
16.26.020 Minimum right -of -way trafficway width.
16.26.025 Geometrics and profiles.
16.26.030 Intersections.
16.26.035 Guardrails and shoulder widening.
16.26.040 Road construction standards.
16.26.045 Drainage.
16.26.050 Sign, subdivisions and road names.
16.26.055 Exceptions to minimum requirements.
16.26.010 General requirements. A. These design criteria,
specifications, and standard details are minimum standards for the design of
improvements, kind and use of materials and methods of construction for
roadways, alleys, and drainage, which lie within public rights -of -way or
easements.
It is the policy of the Borough to adhere to these standards and specifi-
cations; however, if the design standards cannot be followed as contained
herein due to unusual terrain, soil characteristics or drainage, the Engineer-
ing Department will consider alternate solutions and may approve changes when
substantiated by a design analysis prepared by an engineer.
B. Any soils reports or certification documents of public improvements
submitted by the subdivider shall be certified by a registered professional
engineer licensed to practice engineering in the State of Alaska. This
certification shall signify that the documents were prepared by the engineer
or under his direct supervision and in accordance with the laws of the State
of Alaska governing such practices.
16.26.015 Road classifications. A. Local roads are designed to
provide direct access to individual properties, including cul -de -sacs serving
RR1, RR2, and Conservation zoning districts.
B. Arterial roads are designed to move through traffic at moderate
speeds to and from major traffic generators, or into and /or out of a
community.
C. Collector roads are designed to move traffic from local roads to
arterial roads.
D. Alleys are designed to provide secondary access to areas proposed for
multiple dwellings, commercial or industrial uses or subdivisions where
service access, rear parking or loading is desirable.
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16.26.020 Minimum right -of -way and trafficway widths.
A. Minimum right -of -way and trafficway width shall be as follows:
Minimum Minimum
Minimum Unpaved Paved
Road Classification Right -of -Way Trafficway Trafficway
Local road (within 60 feet 20 feet n/a
Conservation zoning
district)
Local road 60 feet 23 feet 20 feet
Collector road 60 feet 27 feet 24 feet
Arterial road 80 feet 33 feet 30 feet
Alley 20 feet 18 feet 15 feet
Cul -de -sac (serving 50 feet 20 feet 18 feet
no more than six 7200 square
foot lots)
B. Rights -of -way shall be of sufficient width to accommodate the roadway
to be constructed with adequate room outside the roadway prism for installa-
tion of utilities.
C. City streets shall be designed to meet the minimum trafficways
prescribed by the particular city involved.
16.26.025 Geometrics and profiles. A. Horizontal Curves. Changes
in horizontal alignment of the roads shall be made through the use of horizon-
tal circular curves. The radii of which shall not be less than:
1. Local road, one hundred seventy -five feet;
2. Collector road, two hundred thirty -five feet;
3. Arterial road, four hundred twenty -five feet;
4. Cul -de -sacs, fifty feet at the bulb.
B. Compound curves and broken -back curves should not be used. Reverse
curves should have an intermediate tangent of one hundred (100) feet or more,
unless the curve radii are three hundred (300) feet or more.
C. Gradients.
The maximum permitted road grade shall be eight percent except that
cul -de -sac areas and temporary turnarounds shall not exceed four percent. The
Borough Engineering Department may approve road grades to fifteen percent if a
plan and profile of the road is submitted by a registered engineer, and the
Borough Engineer concludes that safety standards are met.
16.26.030 Intersection. A. Streets shall intersect at an angle as
close to ninety degrees as feasible, and in no event, at an angle less than
seventy -five degrees. Corner roundings with a twenty -foot radius shall be
required at intersections. Not more than two roads shall intersect at one
point.
B. The distance between intersection centerlines shall not be less than
two hundred feet.
C. Intersection road grades shall not exceed four percent within one
hundred feet of the intersection with the through road centerline. The
through road grade shall not exceed seven percent at the intersection.
D. Intersection sight distances are as follows:
1. Intersecting local roads shall have a minimum sight distance of
two hundred feet.
2. Collector roads shall have a minimum sight distance of two
hundred seventy -five feet measured from the intersecting roads centerline.
3. Arterial roads shall have a minimum sight distance of four
hundred fifteen feet measured from the intersecting road centerline.
E. The subdivider shall obtain approval from the State of Alaska.
Department of Transportation and Public Facilities before intersecting with
any State -of- Alaska - maintained roads.
16.26.035 Guardrails and shoulder widening. Guardrail installation
and required shoulder widening shall be provided in accordance with Section
11 -45 -1 of the State of Alaska Department of Transportation Highway Precon-
struction Manual on collector and arterial roads.
Ordinance No. 83 -47 -0 (A)
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16.26.040 Road construction
construct w t
c hap ten percent b u ase course standards.
subbase as weight o non- rost A. Al) roads
shall percent
as weight passing the No. 200 us i ep e ibl e materi
sieve. The minimun
Local road
Collector road 18"
Arterial road 24"
Alley 30"
Cul -de -sa 12"
18"
depth of subbase shall be measured from projection into the roadway om the
B. All roads Y Prism,
The de point
rock with no more than ten be constructed with of the highs
rock by index of an percent by weight a course of two
minimum depth ex base g than 4 as g t Pasineg the No. 200
course shall b as d etermined by Y �SHTO T - 9 i
Local road
Collector road 4"
Arterial 4"
Alley 6"
Cul -de -sa 4 "
4"
C. All roadway construction shall
subbase depth the required subbase prior have all or
D. ransition area from to material rr
Al) Al stumps shall °m cut p or constructior
on be flush to fill,
where the taking shall cut,
E. All co nstruction °f additional be contained
easements additional slope easements the ri ght - of-way the plat
of the F. All co nstruction tien �'nts is noted
Alaska D shall for utilities, o^ the plat
additional are provided f done in or nt on be rtation and Public accordance F acilities with the i+
tar
Ycat ons of Trans..
satisfactory Psu or of er s struct on,
supporting data etc a hits may
16.26.045 and approval by the Borou upon submitta
provided o su Oraina e. gh Engineer. sh,
Minimum culvert sizenfore and A. Drainage ditchin
least a one percent drainagesshall be seasonal high the diameter
e
least a have a percent drainage grade through twenty -four g water v
mined he bottom of a r the B 9 inch rough the pip i nch e s diameter
orough ei gh t ee n diameter culvert Drive rise c
the roadw unless otherwise c
of the ditch subbase shoulder, ditch shall be
the slope except 1n rock�cutshw slope fromlthet eight (8) feet t
Pe shall except 2:1 re the distance shoulder
shall be six to the t
vision ns (6) fee
16 ' 26 .050 Si
names s a su bdivisions
vision
subdivision ad and s ubdivision y t e and road names, A. Road and B. names s ubdivision s names shall nnotg up an e on n9 existing r a sul
existing names. A road name or sound such duplicate istin
a new road ees. the name shall du that they ng road name only
within fifty road wi a g road.
be signed Y fee r its subdivision shall be e � ld ed by the d slgr
9ned and dt point of egress and be identifi
2, Yield identified within fifty i ^9r p Cul-de-sac of 1fl and s i r
intersections signs shall y feet of their sac roads
within gns shall ofovided at all collector r and ante.
edition the subdivision.
ccord lector and arterial
3. All roads shall
of the Alaska Traffic be si g n ed in
Manual, accordance with the most recen.
requi 16.26.055 Exce.
e1nents o tions to mini s c
down subject to actual field er are g ,e mum re •e a
plans by the B field conditions upon an. justedinithe
orough Engineer, pon review and ad either i
approval of engin
Ordinance No. 8 3 -47 -0 (A)
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Section 2: The provisions of this ordinance shall be effective immediatF
upon passage and approval.
PASSED AND APPROVED by the Kodiak Island Borough Assembly this
2nd day of June
1983.
ATTEST:
By
oroug
FIRST READING AND APPROVAL: Ma 12, 1883
SECOND READING, PUBLIC HEARING, PASSAGE: June 2, 1983
EFFECTIVE DATE:
June 2, 1983
RECOMMENDED BY:
Ordinance No. 83 -47 -0 (A)
Page 4
KODIAK ISLAND BOROUGH
ug ayor, 'eputy