Park land areas in the County of Marin that are under the jurisdictions of: various agencies of the Federal Government, including the National Park Service; various agencies of the State of California, including State Parks; the County of Marin; Cities; Towns; School Districts and other.

Data is obtained from a specific park parcels map on MarinMap.

Percent of historical Northern Spotted Owl sites occupied by pairs each year, as surveyed by the National Park Service and Point Blue Conservation Science.

Proportion of Northern Spotted Owl nest trees by species, from 1997 to 2018, for 584 nest sites monitored by Point Blue Conservation Science and the National Park Service throughout Marin County.

Proportion of the 72 sites occupied by Spotted Owl pairs in 2018 by landowner or land manager, as surveyed by Point Blue Conservation Science and the National Park Service. Not all potential habitat is surveyed every year, so actual numbers of pairs per land management agency or owner may differ from these figures.

Work on trails and roads in the County of Marin's parks and preserves, in efforts to reduce erosion. The work has three main benefits: (1) maintain the sustainability and serviceability of the trails and roads; (2) reduce sediment deposition within the watershed; and (3) improve the visitor experience. Data is updated annually.

Percent of Northern Spotted Owl pairs with known successful nests each year, as surveyed by the National Park Service and Point Blue Conservation Science. Data are collected on California State Parks, Marin County Parks, Marin Municipal Water District, Municipal, National Park Service, and private lands.