§ 50-578. Road requirements for specific kinds of subdivisions.

(a)

Lot sizes less than ten acres. In any subdivision where one or more lots are less than ten acres in size, and which is located in a residential district, or, in a commercial development, all roads within or providing access to the subdivision shall be paved and shall be constructed to the county road department standards, as provided in this section.

(b)

Lot sizes ten to 20 acres. In any subdivision where all lots are ten acres or more, and which is located within a residential district, some roads may be unpaved (no surface course), but shall be limerocked and constructed to the county road department's specifications according to the following requirements:

(1)

All local I and local II roads may be unpaved; but shall be limerocked and constructed to the county road department's specifications, depending upon topography, and other special circumstances as determined by the board of county commissioners after review and recommendations have been made by the county road department or county engineer or the planning commission.

(2)

All collector I and collector II streets shall be paved.

(3)

All section line streets may be required to be paved regardless of classification.

(c)

Subdivisions in an agriculture/rural residential district. In any subdivision where all lots are ten acres or more, and which is located within an agriculture district, roads may be generally unpaved (no surface course), but shall be limerocked and constructed to the county road department's specifications according to the following requirements:

(1)

All collector streets shall be paved.

(2)

All section line streets may be required to be paved after review and recommendations have been made by the county road department or the county engineer or the planning commission.

(d)

Subdivisions in a forestry/rural residential district where all tracts are 20 acres or larger. In the event an applicant desires to plat divisions of property where all the tracts of land are 20 acres or larger, roads may be generally unpaved (no surface course) subject to the following requirements:

(1)

All collector roads shall be paved.

(e)

Unpaved streets. Those subdivision streets which are unpaved shall conform to all other requirements of this article.

(f)

Lot area measurement. For the purpose of this article, a given development may include a portion of the right-of-way of an adjoining federal-, state-, county- or city-maintained road or easement to obtain the necessary area to satisfy the minimum lot area requirements. Such federal, state, county or city maintained right-of-way or easement not greater than the fronting length of the tract being subdivided, and for a distance into such right-of-way or easement not greater than 50 feet or beyond, the centerline of such right-of-way or easement, whichever is lesser. Provided, however, no lot, tract or parcel area within such development shall have a net area less than 85 percent of the specified minimum lot area requirement when such right-of-way or easement is excluded from the computation. Provided further that in subdivisions containing lots, tracts or parcels five acres in size or greater, interior road right-of-way or easements may also be utilized to obtain the necessary area to satisfy the minimum lot area requirement, but such interior road rights-of-way or easements may not be so utilized for subdivisions containing lots, tracts or parcels less than five acres in size.

(g)

Tie-ins to existing roads.

(1)

Any new rock road connecting to an existing paved road must be paved from the point of curvature of the radius of the new road to the edge of the pavement of the existing paved road.

(2)

Any new rock road connecting to a state-maintained road, arterial road, major collector road or any other road deemed necessary by the county road department must have paved acceleration and deceleration lanes along the road being accessed to. These lanes shall be built according to the specifications required by the state department of transportation.

a.

Thresholds and design standards will be dependent upon the functional classifications of the new road and the existing road, and upon projections of trip generation from or through the subdivision being served.

b.

Storage lanes may also be required, also depending upon functional classifications and trip generation.

(1991 LDR ch. 71, § 3.25; Ord. No. 2007-03, § 16, 7-17-2007; Ord. No. 2007-07, § 7, 11-20-2007)