Roadway Standards Section 320 – Parking Areas

320.1 Maximum Slopes and Grades

The plan review, permit and inspections for ADA improvements will be covered under a Development Permit when they are not related to a building permit under review.
The ADA facilities should be designed with a 0.5% tolerance from maximum slopes and grades.
General parking areas and adjacent drive aisle slopes should not exceed +/-5%.
Drive aisles not adjacent to parking spaces should not exceed a longitudinal slope of 10%. Cross slopes shall not exceed 5%.

Walkway connections to the public sidewalk shall meet ADA landing area requirements per PROWAG and be reviewed and permitted by Engineering.
Onsite accessible routes, when permitted through a Development Permit, shall meet the requirements of the latest version of the Oregon Structural Specialty Code (OSSC) Chapter 11 and the International Code Council (ICC) A117.1.

All vehicle maneuvering shall be provided on site and should limit backing maneuvers in locations where pedestrians are expected.

For dimensions of parking spaces and drive aisles refer to Standard Drawings P100 and P200.
To be considered a parking space, adequate maneuvering area shall be provided for each vehicle to enter and exit said parking space.
All garbage and recycling facilities shall have adequate access, with onsite maneuvering and circulation for the service provider's vehicle.
All movements for non-passenger design vehicles should be shown on an exhibit, showing paths traced by the extremities of the vehicles, including off-tracking. Adequate turning radii shall be provided for all loading spaces and the largest anticipated vehicles maneuvering on site and at driveway approaches. At a minimum, the circulation of a fire truck and garbage truck shall be illustrated.

The parking and maneuvering surface (gravel or paving) shall comply with ZDO Section 1015 or with Standard Drawing R100 if not related to development.
The structural section of parking and drive aisle areas shall meet or exceed Standard Drawing R100.

All automobile off-street parking quantity and dimensions shall meet the ZDO and Roadway Standard Drawing P100 or P200
Dimensions for on-street parking spaces shall meet or exceed the requirements of Roadway Standard Drawing P100 or P200. The on-street parking shall utilize the street for the drive aisle. The parking spaces shall not diminish or obstruct the required travel lanes or bike lanes.
All compact, carpool, disabled, and loading berth spaces shall be labeled on the plans.
Accessible parking spaces shall meet the requirements of the Oregon Transportation Commission's Standards for Accessible Parking Places, latest edition.

If parking lot curbs carry, direct or channel surface water, the curb should be structural curb.
Alternative curbs will be considered when it is determined by Engineering that structural curb is not the most appropriate.
Extruded curbs shall not be used for carrying, directing or channeling surface water, or as a vehicle wheel stop.

All traffic control devices on private property shall be installed and maintained by the property owner. Traffic control devices that are located where private driveways intersect a road right-of-way shall be kept in good condition.
The applicant shall provide a signing and pavement marking plan to Engineering for onsite parking and circulation. This plan shall be reviewed and approved by Engineering and the local fire service provider prior to the applicant being issued a Development Permit.
All compact, carpool, disabled parking spaces shall be clearly marked on the site.

Comply with Section 220.

A part of the Roadway Standards. Contact engineering@clackamas.us for drawings or information.