As used in this chapter:
(1) "Catastrophic public nuisance" means a condition on state or federal land where natural resources and biota have been managed or neglected to such an extent as to cause:
(a) the threat of a catastrophic wildfire demonstrated by:
(i) stand density, basal area, or ground fuel load greater than 150% of land health standards; or
(ii) an insect or disease infestation severe enough to threaten the mortality of at least 20% of the trees in the area; or
(b) a condition in the area that threatens the:
(i) quantity or quality of the public water supply of a political subdivision;
(ii) health, safety, or welfare of the citizens of a political subdivision;
(iii) air quality of a nonattainment area; or
(iv) vegetative resources required to support land health and authorized livestock grazing.
(2) "Chief executive officer" means:
(a) for a municipality:
(i) the mayor, if the municipality is operating under a form of municipal government other than the council-manager form of government; or
(ii) the city manager, if the municipality is operating under the council-manager form of government; and
(b) for a county:
(i) the chair of the county commission, if the county is operating under the county commission or expanded county commission form of government;
(ii) the county executive officer, if the county is operating under the county-executive form of government; or
(iii) the county manager, if the county is operating under the council-manager form of government.
(3) "County sheriff" means an individual:
(a) elected to the office of county sheriff; and
(b) who fulfills the duties described in Section 17-72-201.
(4) "Federal agency" means the:
(a) United States Bureau of Land Management;
(b) United States Forest Service;
(c) United States Fish and Wildlife Service; or
(d) National Park Service.
(5) "Federally managed land" means land that is managed by a federal agency.
(6) "Political subdivision" means a municipality or county.