More Oregon Wetlands (MOW) consists of an edited subset of records from the Oregon Wetlands Cover (2009), including those wetland polygons that were not part of a finalized National Wetlands Inventory project, nor generated as part of a Local Wetland Inventory (as indicated by attribute information in the Data_S_Year and Data_S_Type fields). Overlap between MOW polygons and NWI and LWI polygons may exist.

The MOW dataset includes mapping of individual wetland sites by a variety of federal, state, academic, and nonprofit sources. Because MOW is based on the NWI framework, it represents all wetland categories in the Cowardin classification (Federal Geographic Data Committee. 2013. Classification of wetlands and deepwater habitats of the United States. FGDC-STD-004-2013. Second Edition. Wetlands Subcommittee, Federal Geographic Data Committee and U.S. Fish and Wildlife Service, Washington, DC. <https://www.fgdc.gov/standards/projects/wetlands/nwcs-2013>) that are known to be present and mappable in Oregon. It includes perennially inundated "open water" aquatic habitats such as lacustrine limnetic, riverine (all subsystems), and marine and estuarine intertidal and subtidal. Man-made water features such as industrial detention ponds, log ponds, municipal sewage treatment lagoons, and flooded gravel pits are also included because they are often habitat for wetland biota. Portions of upland riparian areas may also be included where they are intermixed with riverine or palustrine wetlands and cannot be separated at the scale used in original mapping.

Metadata for the MOW feature dataset was imported from the Oregon Wetlands Cover (2009) and edited as needed.