ROAD STANDARDS
SUMMARY OF CONSTRUCTION REQUIREMENTS
| Road Classification |
Typical ADT |
Base Rock 4" / 3/4" |
Surface Type |
Surface Width /Thickness |
Bike Lane |
Shoulder Width/type |
Design Speed |
Max Super |
Max Grade |
| Driveway |
0-10 |
8"/2" |
Gravel |
12' |
NO |
None |
NA |
4% |
12% avg. (6) |
| Private Road (7) |
0-100 |
8" / 2" |
Gravel (2) |
20' (1) |
NO |
None |
15 |
4% |
12% avg. (6) |
| Public Road - Local |
0-500 |
10" / 2" |
Asphalt Concrete |
20' / 3" |
YES (3) |
3' / Gravel (4) |
25 |
4% |
12% |
| Public Road - Collector |
500-1500 |
12" / 2" |
Asphalt Concrete |
24' / 4" |
YES (3) |
4' / Gravel (4) |
35 |
6% |
10% |
| County Road -Local |
0-500 |
10" / 2" |
Asphalt Concrete |
20' / 4" |
YES (3) |
3' / Gravel (4) |
25 |
4% |
12% |
| County Road -Collector |
500-1500 |
12" /2" |
Asphalt Concrete |
24' / 4" |
YES (3) |
4' / Gravel (4) |
35 |
6% |
10% |
Notes:
- 12 feet of roadway width for one or two parcels only.
- Pavement required if average grade is greater than 12%.
- If designated by agency with jurisdiction.
- 8 feet of pavement on both sides if road falls in urban area.
- 4% max in urban areas.
- Maximum of 17% if paved and approved by local fire department.
- May access up to 6 parcels.
The road standards above are for new or reconstructed roads.
COLUMBIA COUNTY ROAD STANDARDS - 1996 EDITION
- Part 1 - INTRODUCTION
- Part 2 -
- OVERVIEW OF ROAD STANDARDS
- FIRE SERVICE REQUIREMENTS
- ACCESS APPROACH
- PRIVATE ROADS
- EXISTING PUBLIC ROADS
- Part 3 - CREATION OF NEW PUBLIC ROADS
- Part 4 - STANDARD DRAWINGS
- Part 5 - EXHIBITS
TRANSPORTATION SYSTEM PLAN
Download Entire Transportation System Plan (6.84 MB) RECOMMENDED FOR HIGH-SPEED CONNECTIONS ONLY
Questions about the Columbia County Road Standards can be answered at the Road Department Office.
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