2011 ORS § 105.668¹
Immunity from liability for injury or property damage arising from use of trail or structures in public easement or right of way

(1) As used in this section:

(a) Structures means improvements in a trail, including, but not limited to, stairs and bridges, that are accessible by a user on foot, on a horse or on a bicycle or other nonmotorized vehicle or conveyance.

(b) Unimproved right of way means a platted or dedicated public right of way over which a street, road or highway has not been constructed to the standards and specifications of the city with jurisdiction over the public right of way and for which the city has not expressly accepted responsibility for maintenance.

(2) A personal injury or property damage resulting from use of a trail that is in a public easement or in an unimproved right of way, or from use of structures in the public easement or unimproved right of way, by a user on foot, on a horse or on a bicycle or other nonmotorized vehicle or conveyance does not give rise to a private claim or right of action based on negligence against:

(a) A city with a population of 500,000 or more;

(b) The officers, employees or agents of a city with a population of 500,000 or more to the extent the officers, employees or agents are entitled to defense and indemnification under ORS 30.285 (Public body shall indemnify public officers);

(c) The owner of land abutting the public easement, or unimproved right of way, in a city with a population of 500,000 or more; or

(d) A nonprofit corporation and its volunteers for the construction and maintenance of the trail or the structures in a public easement or unimproved right of way in a city with a population of 500,000 or more.

(3) Notwithstanding the limit in subsection (2) of this section to a city with a population of 500,000 or more, by adoption of an ordinance or resolution, a city or county to which subsection (2) of this section does not apply may opt to limit liability in the manner established by subsection (2) of this section for:

(a) The city or county that opts in by ordinance or resolution;

(b) The officers, employees or agents of the city or county that opts in to the extent the officers, employees or agents are entitled to defense and indemnification under ORS 30.285 (Public body shall indemnify public officers);

(c) The owner of land abutting the public easement, or unimproved right of way, in the city or county that opts in by ordinance or resolution; and

(d) A nonprofit corporation and its volunteers for the construction and maintenance of the trail or the structures in a public easement or unimproved right of way in the city or county that opts in.

(4) The immunity granted by this section from a private claim or right of action based on negligence does not grant immunity from liability:

(a) Except as provided in subsection (2)(b) or (3)(b) of this section, to a person that receives compensation for providing assistance, services or advice in relation to conduct that leads to a personal injury or property damage.

(b) For personal injury or property damage resulting from gross negligence or from reckless, wanton or intentional misconduct.

(c) For an activity for which a person is strictly liable without regard to fault. [2011 c.528 §1]