Iowa Code § 321G.22: Limitation of liability by public bodies and adjoining owners.

1. The state, its political subdivisions, and the owners or tenants of property adjoining public lands or the right-of-way of a public highway and their agents and employees owe no duty of care to keep the public lands, ditches, or land contiguous to a highway or roadway under the control of the state or a political subdivision safe for entry or use by persons operating a snowmobile, or to give any warning of a dangerous condition, use, structure, or activity on the premises to persons entering for such purposes, except in the case of willful or malicious failure to guard or warn against a dangerous condition, use, structure, or activity. The state, its political subdivisions, and the owners or tenants of property adjoining public lands or the right-of-way of a public highway and their agents and employees are not liable for actions taken to allow or facilitate the use of public lands, ditches, or land contiguous to a highway or roadway except in the case of a willful or malicious failure to guard or warn against a dangerous condition, use, structure, or activity.

2. This section does not create a duty of care or ground of liability on behalf of the state, its political subdivisions, or the owners or tenants of property adjoining public lands or the right-of-way of a public highway and their agents and employees for injury to persons or property in the operation of snowmobiles in a ditch or on land contiguous to a highway or roadway under the control of the state or a political subdivision. The state, its political subdivisions, and the owners or tenants of property adjoining public lands or the right-of-way of a public highway and their agents and employees are not liable for the operation of a snowmobile in violation of this chapter.