R-10  --  Residential Alpine/Slope District

The R-10 district is intended for those areas in the municipality where natural physical features and environmental factors such as slopes, vegetation, alpine and forest, soils, slope stability and geologic hazards require unique and creative design for development.  This district is governed by section 21.40.115 of the municipal code.

Average

Lot Requirements

Yard Requirements

Building Height

Driveway

Landscaping

Stable

Lot

 Area

 Width

Building

Impervious

Front

Side

Rear

Special

Principal

Detached Garage

Accessory

Surface

Required

Setback

Slope1

 

 

Coverage

Surface2

 

 

 

 

 

 

 

 

 

 

More than 30.00%

7.50 acres

300 feet

3%

8%

None

50 feet

None

3

30 feet

25 feet

18 feet

Gravel

Special4

25 feet

25.01% - 30.00%

5.00 acres

300 feet

5%

10%

None

25 feet

None

3

30 feet

25 feet

18 feet

Gravel

Special4

25 feet

20.01% - 25.00%

2.50 acres

180 feet

8%

14%

None

25 feet

None

3

30 feet

25 feet

18 feet

Gravel

Special4

25 feet

15.01% - 20.00%

1.25 acres

100 feet

10%

20%

None

25 feet

None

3

30 feet

25 feet

18 feet

Gravel

Special4

25 feet

15.00% or less

0.50 acres

100 feet

25%

40%

None

25 feet

None

3

30 feet

25 feet

18 feet

Gravel

Special4

25 feet

1 The formula to determine average lot slope S is: S=(I)(L)(0.0023)/A where I is the contour interval (maximum of 20 feet), L is the sum of the length of all contours on the lot or tract, and A is the area of the lot or tract in acres.  One acre equals 43,560 square feet.
2 All parking areas, driveways, roads, sidewalks and walkways, whether paved or not, and any areas covered by buildings or structures, concrete, asphalt, brick, stone, wood, ceramic tile or metal, are considered to be impervious surfaces.    
3 No construction or excavation is permitted within 100 feet of the mean high water line of any stream, lake or other permanent body of water.
4 Ground cover and vegetation shall be maintained to control erosion and sedimentation.  All areas that are denuded for any purpose shall be revegetated or the soils stabilized to prevent erosion and sedimentation prior to November 1 in the year of construction.  No excavation shall be permitted after November 1 or before May 1 except under emergency conditions, as determined by the Building Official.
Only a single principal structure is allowed on any lot or tract.