All private roads (including extensions of previously approved private roads) shall be constructed to the following standards (see also section 8-1A-2, figure 13 of this title):
A. Design Standards:
1. The private road shall be constructed on a perpetual access easement or a single platted lot that originates from a public street and provides access to all applicable properties.
a. Outside an area of city impact, the easement or lot shall be a minimum of thirty feet (30') in width. Inside an area of city impact, the easement or lot shall be a minimum of fifty feet (50') in width.
b. If located on a lot, the primary function of the lot shall be to accommodate the private road. Minimum parcel size requirements shall not apply.
2. All properties abutting an approved private road shall have the same minimum required street frontage as required by the applicable base district, except: If the turnaround for the private road is located within a property as illustrated in section 8-1A-2, figure 14 of this title, the required frontage shall be thirty feet (30') (the width of the private road easement).
3. The point of connection of the private road and the public street shall be approved by the Ada County highway district or the Idaho Transportation Department if abutting a state highway.
4. The private road shall terminate at a forty five foot (45') radius cul-de-sac or other approved turnaround configuration.
a. The turnaround may be located in an area of the property other than where the private road enters the property (see section 8-1A-2
, figure 14 of this title).
b. If the applicant proposes an alternate location and/or configuration for the turnaround, the following additional standards shall apply:
(1) The applicant shall provide written approval from the appropriate fire district.
(2) The county engineer shall review and approve the alternate location and/or configuration.
5. The private road shall only intersect a public road at its origination point.
6. The private road shall not intersect another private road.
7. New gates or other travelway obstacles shall not be allowed except in exceptional circumstances when the director determines the gate or gates are necessary to improve safety or to halt environmental degradation in the area. Before approving a new gate or other obstacle, the director shall provide the fire district, or if no fire district, the Ada County sheriff, with advice from the Idaho state fire marshal's office, the opportunity to review the proposal and offer recommendations.
a. Approved gate openings shall be a minimum of twenty feet (20') wide, be located a minimum of thirty feet (30') from the public right of way, and when the gate is open, the travelway, for its entire width shall be clear and unobstructed.
b. Gates located on one-way roads shall open in the same direction that traffic moves. Gates located on two-way roads must open in both the directions that traffic moves. Gates that open upward shall not be allowed.
c. Gates shall have a fail-open lock in the event of a loss of power.
8. No segment of the travelway of a private road shall exceed ten percent (10%) grade. Fire apparatus roadways in locations that front buildings, at intersections with other roads, and in front of fire hydrants, shall not exceed eight percent (8%) grade.
9. If the private road is located within the wildland-urban fire interface overlay district, the additional design standards listed in section 8-3B-3 of this title shall apply.
10. Upon the county engineer's review of the proposed private road design, the applicant may be required to submit a drainage study before constructing the private road.
1. Private roads that will serve development located within an area of impact and exceeds a density of three (3) dwelling units per acre shall be constructed to the Ada County highway district standards for urban local roads.
2. All other private roads not defined in subsection B1 of this section shall be constructed to the following standards:
a. Private roads that will provide frontage or access to four (4) or fewer properties shall have a travelway with a minimum improved width of twenty feet (20'). Private roads that will provide frontage or access to more than four (4) properties shall have a travelway with a minimum improved width of twenty four feet (24').
b. The travelway shall have a stable, compacted base.
c. There shall be a crown or transverse slope of two percent (2%) to drain water away from the travelway.
d. The improved surface shall consist of six inches (6") of compacted three-fourths inch (3/4") minus crushed gravel or other materials approved by the county engineer. Private roads that provide frontage and/or access to more than four (4) properties shall be paved with 2.5 inches of asphaltic concrete.
e. Any segment of a travelway of a private road greater than five percent (5%) grade shall be improved with asphalt or concrete paving.
f. For the purposes of this section, corner properties that abut a private road shall be counted as taking access off the private road. Temporary dedicated open space lots that were created as part of a nonfarm subdivision shall also be counted as taking access off the private road.
C. Alternative Design Allowed For Private Road: Upon recommendation of the county engineer, the director may approve, or recommend approval of alternative design or construction standards when the applicant can demonstrate that the proposed overall design meets or exceeds the intent of the required standards of this article and shall not be detrimental to the public health, safety, and welfare. (Ord. 389, 6-14-2000; amd. Ord. 426, 9-26-2001; amd. Ord. 490, 4-9-2003; amd. Ord. 628, 7-12-2006; amd. Ord. 699, 6-18-2008; amd. Ord. 848, 12-9-2015; amd. Ord. 902, 10-2-2019)
Notes
| 1 | 1. See also section 8-1A-2, figure 13 of this title. |