2 rules for unincorporated Clackamas County, Oregon.
Verified from official government sources
Clackamas County has no formal 'dark-sky' overlay, but ZDO Subsection 1005.04 requires outdoor lighting not to direct light skyward: fixtures must shield and direct light downward, pole-mounted lights cannot exceed 25 feet, and entrance lighting is capped at 12 feet. Holiday lights and street lights are exempt.
Clackamas County ZDO 1005.04(A)
Outdoor lighting devices shall not direct light skyward; shall direct downward and shield light, or direct light specifically toward walls, landscape elements, or other similar features, so that light is directed within the boundaries of the subject property.
Clackamas County's ZDO addresses light trespass through Subsection 1005.04, which requires outdoor lighting to be shielded and directed so light stays within the subject property. Illuminated signs also may not shine into dwellings. There is no residential foot-candle limit; persistent spillover is treated as a nuisance.
Clackamas County ZDO 1010.02(I)(1)
Internally illuminated signs, or external lights used to illuminate signs, shall be placed, shielded, or deflected so they do not shine into dwellings or impair the vision of the driver of any vehicle.
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