Table No. 1 TABLE FOR CULVERT SIZING

Required

Inches Cubic Ft. per Sec.)

Less than 15 12 2

16 to 72 18 6

73 to 130 24 12

131 to 270 30 20

271 to 460 36 32

461 to 720 42 46

721 to 1,025 48 65

1,026 to 1,450 54 89

1,451 to 1,870 60 112

Strongly consider having culverts larger than 60 inches designed, or consider alternative structures, such as bridges, mitered culverts arches, etc.

Culvert Diameter, (Cubic Ft. per Sec.)

Inches

1,871 to 2,415 66 142

3,356 to 5,335 84 260

5,336 to 7,410 96 370

7,411 to 9,565 108 500

9,566 to 11,780 120 675
Culverts larger than 120 inches must be designed; consider alternative structures.

3. 
   Bridge Requirements: Bridges are required at some stream crossings instead of culverts because of stream size or terrain factors. Bridges installed on roads subject to these standards shall be designed for AASHTO HS-20 loadings and for two-foot stream clearance at 100-year flood peak flow. Structural materials allowed are prestressed concrete, conventionally reinforced concrete, galvanized steel, weathering steel, painted steel, and pressure-treated wood. Any bridge installed subject to these standards shall be designed by a Professional Engineer registered in Idaho. Bridge widths shall be such that the total roadway (travelway plus shoulders) is not narrowed as the road crosses the bridge.
   

4. 
   Driveway Drainage and Grade: At the entrance of any driveway to any road subject to these Standards, there shall be a Section of driveway not less than 20-feet long having a grade not steeper than two-percent (2%) uphill or downhill, to afford drivers of vehicles entering the highway opportunity to look for traffic before proceeding. Driveway entrances to roads shall be constructed with waterbar humps or cross-drain swales to prevent surface water from entering the road surface from the driveway, in addition to culverts required in Section 4D-5(B), foregoing. Waterbar humps, if used, shall be at least 0.3-foot high. Cross-swales, if used, shall be at least 0.3-foot lower than the road shoulder at the entrance. Driveways shall not be placed where drivers cannot safely observe traffic on the intersecting road such that entry or exit from the roadway cannot be safely accomplished.
   

5. 
   Intersection and Curve Grades: Road grades at intersections or junctions shall be no steeper than two-percent (2%) for a minimum of 100-feet every direction from the centerline intersection point. Intersections with paved public roads or paved PCU (Collector) roads shall have an asphalted surface for the full width of the roadway for a minimum of 50-feet from the pavement edge of the public road or PCU (Collector) road. Maximum road grade on horizontal curves on Public and PCU (Collector) roads shall not exceed the values given in Table 2.
   

Radius Percent Grade Maximum

100 feet to 149 feet 8%

150 feet to 249 feet 9%

250 feet or more 10%

6. 
   Parking Turnouts: Parking turnouts shall be provided wherever accesses are vulnerable to closure by plowed snow or snow accumulation greater than two-feet (2’) in depth. Specific conditions requiring parking turnouts are listed in Table 4, Table of General Design Requirements. Parking turnouts required on PCU (Collector) and PCU (Local) roads shall be located near driveway entrances. Parking turnouts containing a minimum of one (1) space per lot shall be located at the entrances of all Minor roads. Parking turnouts may be either parallel type or perpendicular type, as shown in Drawing Number 2.
   

7. 
   Additional Width/ Horizontal Curves: Road travelways shall be widened at horizontal curves as given in Table No. 3.
   

Radius 1-lane widening 2-lane widening

40 feet to 79 feet 5 feet 5 feet

80 feet to 99 feet 3 feet 3 feet

100 feet to 149 feet 2.5 feet 2.5 feet

150 feet to 249 feet 1.5 feet 1.5 feet

250 feet to 400 feet 1 foot 1 foot

More than 400 feet Not required Not required

8. 
   Cut and Fill Slopes: Cut and fill slopes of roadway Sections as completed shall conform to the following requirements:
   

1. 
   Except where a Soils and Geology Report by a licensed Professional Engineer or Professional Geologist stipulates that materials on a specific site will be stable at steeper slopes shall be as follows:
   
   1. 
      For Sections where the cut as measured from the uphill shoulder is less than or equal to 10-feet vertically, cut slope shall not be steeper than 1:1.
      
   2. 
      For Sections where the cut as measured from the uphill shoulder is greater than 10-feet vertically, cut slope shall not be steeper than 1.5:1.
      

2. 
   Where a Soils and Geology Report by a licensed Professional Engineer or Professional Geologist identifies native materials at road locations, cut slopes shall be as recommended by such report but not steeper than the following:
   
   1. 
      in Solid Rock requiring blasting, 0.5:1.
      
   2. 
      in Jointed Rock removable by ripping, 0.75:1.
      
   3. 
      in Naturally Cemented or Bonded Material, 1:1, or
      
   4. 
      in Loose Material, 1.5:1.
      

3. 
   Fill slopes shall be not steeper than 1.5:1.
   

9. 
   Materials Requirements: Surface and base course gravel used on Public Roads shall be as hereinafter stipulated for PCU roads, except that material from specific sources may be approved by the County Road Superintendent without laboratory testing based on the County Road Department’s prior experience with material from such sources. Surface course gravels used on PCU roads shall be granular material ¾-inch or smaller and having a Hveem R-value not less than 80. Base course gravels used on PCU roads shall be granular materials four-inches (4”) or smaller and having a Hveem R-value not less than 55. Base course requirement is waived if native material is gradable and has a Hveem R-value 55 or greater. Surface course requirement is waived if native material is gradable and has a Hveem R-value 80 or greater, or if native material is sound rock that does not rut under traffic nor break during spring thaw. In lieu of determining R-value or experience history of imported base and surface aggregate materials, the pertinent graduation and placement requirements of the Idaho Standard for Public Works Construction, most recent edition, may be applied.
   

10. 
    One-Lane Road Construction Criteria: A PCU (Minor) road may be designed according to the One-Lane Road Design Standards if it meets the following criteria:
    

1. 
   The number of lots served is less than or equal to four (4).
   

2. 
   There is no possibility to extend the One-Lane Road. Impossibility to expand the use of the One-Lane Roads shall be demonstrated by terrain barriers, currently complete development of adjacent land or ownership of adjacent properties by Federal or State government agencies. If future development potential raises the number of lots served above the value stated in Criterion (1), an existing One-Lane Road shall be improved to the PCU (Local) design of Drawing Number 1, “Typical Rural Subdivision Road”.
   

11. 
    One-Lane Road Design Standard: The typical one-lane road shall be designed and constructed as shown in the cross-Section depicted in Drawing 3. Refuge turnouts shall be provided for all One-Lane Roads. The refuge turnouts shall be intervisible, provided as necessary so that the maximum distance between turnouts or Sections of road widened to two-lane width is no more than 1,000-feet or the owner must demonstrate that there is adequate visibility (such as a flat, straight road), and that there is a low hazard severity. The refuge turnouts shall be a minimum of 10-feet wide for a length of 100-feet and shall have a 50-foot taper on each end as depicted in Drawing 4. At all blind curves that have at any point a sight distance less than 400-feet, the road shall be widened to two-lane width as defined by Table 4. Full two-lane width as so defined shall extend from the point of curve to the point of tangent or one-lane width and two-lane width shall have a rate of road-width change not greater than one-foot per ten-feet of centerline length. One-Lane Roads shall have sight distances as listed in Table 4, Table of General Design Requirements. Criteria for measuring stopping distance shall assume a height of eye of 3.50 feet and a height of opposing vehicle of 4.25 feet.
    

12. 
    Road Grades: Maximum vertical road grades shall not exceed 10%.
    

Table No. 4, “Table of General Design Requirements” sets forth the minimum design and construction requirements established by this Section.

Roads PCU Roads Roads Roads

Maximum No Limit No Limit 50 4

Lots Served
Maximum Length No Limit No Limit 5,000' if 2,000’

dead-end

16,000'

if looped*

Possible³? Yes Yes No No

Allowed⁴? Note ¹ No Yes Yes

Grade
Minimum

Curve Radius 150' 100' 80' 60'
Design Speed 50 MPH 35 MPH 20 MPH 15 MPH
Refuge Turnout 1,000' or

Spacing N/A N/A N/A sight dist.

Roads PCU Roads Roads Roads

Turnout (Individual)² (Individual)² at Road

Spaces Approach
Sight Curve 400' Curve 250 Curve 200 Curve 300'

Distance Crest 200' Crest 125' Crest 100' Crest 150'

Junction Junction Junction Junction

250' 150' 125' 100'

1. 
   Special Cases Only
   
2. 
   Parking turnout may be waived if driveway approach is six-percent (6%) grade or less for at least the first 50-feet from road.
   
3. 
   “No” applies only if future extension is impossible due to terrain barrier or adjacent Federal or State ownership.
   
4. 
   “Single access” means any road that can be blocked to traffic by a single obstacle, whether looped or not.
   

* Local road may be returned to a second entrance to the same Public or PCU (Collector) road to be credited as looped for greater allowed length. Neither any Local road nor any Minor road shall in any case be connected to join two (2) different roads of higher traffic capacity (i.e., PCU (Collector) roads, Public roads, or highways maintained by other jurisdictions).

Number 3

THIS DECLARATION made on the date hereinafter set forth by , owner of the subdivision known as (hereinafter referred to as Declarant):

WITNESSETH

WHEREAS, Declarant did on the day of 20__, record in the office of the Recorder of Boise County, under Instrument Number , of the Official Records of Boise County, Idaho, a Subdivision Plat or real property located in Boise County, Idaho which is generally described as the Subdivision; and

WHEREAS, Declarant is the owner of the real property generally described as the Subdivision, now

THEREFORE, Declarant hereby declares that (list road names) along with the rights-of-way therefore, (the Subject roads), shall be private and remain private and dedicated to the common use by all property owners within the Subdivision until otherwise deeded to Boise County or another appropriate governmental entity, and as such Declarant shall be responsible for the improvement and maintenance of the same until the Declarant deeds the subject road(s) to a property owners association managed by the individual lot owners of Subdivision provided that such road(s) shall ten meet the minimum standards established by Boise County for Private-Common Use Roads. After transfer to the property owners association, said association shall have the sole continuing obligation to provide all further improvement and/or maintenance to the subject roads until such time, if ever, as the obligation is also spread out amongst the owners of lots within future additions to the Subdivision or until such time as the subject roads are formally accepted by Boise County or another appropriate governmental entity as public roads. Until form acceptance by a public entity, neither Boise County nor any other governmental entity shall have any obligation whatsoever to provide improvements of maintenance of the subject roads and the total responsibility for improvement and maintenance shall be incumbent upon Declarant and after transfer from Declarant, the total responsibility for improvement and maintenance shall be incumbent upon the property owners association for Subdivision and the owners of lots with any future additions to Subdivision which have access to and ingress and egress rights over subject roads.

IN WITNESS WHEREOF, the Declarant has caused his hand and seal to be subscribed hereunto this ___ day of _______________________, 20___.

By:

Title:

STATE OF IDAHO )

COUNTY OF ________________ )

On this ____ day of _____________, in the year _____, before me, a Notary Public, in and for the State of Idaho, personally appeared ____________________, known or identified to me to be the ____________ of the ___________ that executed the instrument on behalf of said ___________, and acknowledges to me that such ___________________ executed the same.

________________________________________

Notary Public

Residing at (Notary Seal)

My Commission Expires:

4E-2 Applicability

4E-3 General Parking Requirements

4E-4 Location of Parking Spaces

4E-5 Parking Area Requirements

4E-6 Parking Lot Design

4E-7 Parking Spaces Required

4E-8 Parking Requirements for Uses Not Specified

4E-9 Common Facilities for Mixed Uses

4E-10 Joint Use of Parking Facilities

4E-11General Provisions; Off-Street Loading
4E-1 Purpose:

The purpose of this Article is to set forth the minimum requirements for off-street vehicular parking and loading for various buildings and land uses in the Multiple Use Zone District.

The following standards shall apply to any new construction, alteration, or moving of a structure or any new or more intense use of property. The number of off-street parking spaces, as hereinafter set forth, shall be provided for all allowed uses. A greater number of spaces may be required in any application involving discretionary approval.

A. Off-street parking and loading facilities drawn to scale shall be shown on a site plan for building permit or Administrator review. This is not required for single-family or two-family dwelling.

B. Whenever a land use is changed or altered (enlarged, increase in number of employees, seating capacity, etc.) in such a manner that will increase the parking space requirement specified by this Ordinance, a site plan showing the design for the additional parking spaces shall be submitted to the Administrator for approval.

C No inoperable or unlicensed vehicles shall be parked within public or private off-street parking areas. Inoperable or unlicensed vehicles may be located in an enclosed building or enclosed back yard.

An off-street parking lot for uses other than residential uses shall be located on the same lot as the principal use the parking lot serves or within five hundred (500) feet of the principal building it serves. This five hundred (500) foot measurement shall be measured from the nearest point of the principal building to the nearest point of the parking lot.

All public or private parking areas which contain five (5) or more parking spaces shall be improved according to the following:

A. All parking areas except those in conjunction with single-family or two-family dwellings shall have surfacing of all weather or durable and dust-free surfacing materials as approved by the Commission.

B. All parking areas, except those required in conjunction with a single-family or two-family dwelling, shall provide a bumper which will prevent cars from encroachment on abutting private or public property.

C. All parking areas, including service drives, which abut a residential area, shall provide a sight-obscuring fence, wall or hedge not less than three (3) feet nor more than six (6) feet in height.

D. Any lights provided to illuminate any public or private parking area shall be so arranged or hooded as to reflect the light away from any abutting or adjacent use.

E. Parking areas for residential uses, except those required in conjunction with a single-family or two-family dwelling, shall not be located in a required front yard.

F. On-site retention of surface water runoff shall be provided that will be adequate to drain the surface of the parking area so as to prevent the flow of water to adjacent properties.

All parking spaces and parking lots shall be designed and constructed to the following minimum standards:

Parking Space Dimensions - Eight (8) feet in width by twenty (20) feet in length.

Parking area aisle widths shall be as follows:

The minimum number of off-street parking spaces required shall be no less than as set forth in Table 2-C.

The parking space requirements for buildings and uses not set forth herein shall be determined by the Commission and such determination shall be based upon the requirements for the most comparable building or use specified herein.

In the case of mixed uses, the total requirements for off-street parking spaces shall be the sum of the requirements for the various uses. Off-street parking facilities for one use shall not be considered to provide parking facilities for any other use except as provided below.

Joint Uses Of Parking Facilities: The Administrator may, upon application, authorize the joint use of parking facilities required by said uses and any other parking facility, provided that:

A. The applicant shows that there is no substantial conflict in the principal operating use of the building or use for which the joint use of parking facilities is proposed.

B. The parking facility for which joint use is proposed is not further than five hundred (500) feet from the building or use require to have provided parking.

The provision and maintenance of off-street loading space is a continuing obligation of the property owner. No building permit shall be issued until plans are presented that show property that is and will remain available for exclusive use of property for which the building permit is issued.

A. Owners of two or more buildings may agree to utilize jointly the same loading spaces, if approved by the Administrator.

B. Areas used for standing and maneuvering of vehicles shall have durable surfaces of asphaltic concrete or dust-free surfacing, maintained adequately for all weather use.

C Loading areas adjacent to residential uses shall be designed to minimize disturbance of residents. Artificial lighting which may be provided shall be so deflected as not to shine or create glare in or on any adjacent dwelling.

D. On-site retention of surface water shall be provided that will be adequate to drain the surface of the loading area so as to prevent flows of water onto adjacent properties.

4F-1 Purpose

4F-2 Applicability

4F-3 Exemptions

4F-4 Procedures

4F-5 Standards

4F-6 Land Use Standard for Signage

4F-7 Enforcement

The purpose of this chapter is to provide maximum visibility for safety purposes along roadways, maintain unobstructed views at intersections and prevent undue distractions to vehicle operators by preventing confusion at or near traffic signs and signals and along corridors.

It is also the intent of this chapter to preserve the rural character by not allowing flashing, reader boards or outsized billboards but to encourage artistic design and creativity through simple effective signage. Therefore, the intent is to promote rural character and not a city center appearance in the county. Furthermore, the intent is to require preplanning of select signage and promote artistic license within the same size limit and similar location for less confusion and clutter. Signs meeting this intent will act as a signature block for creative expression but not an advertising billboard. This chapter contains Sign Standards for uniform but creative signage. The pride of ownership and entrepreneurism is encouraged by artistic signage in the community. Residents and tourists will notice the improvements this makes to the general appearance of Boise County.