Prior to 2011, eight cultural resource investigations have been conducted within the current boundaries of NWSTF Boardman, including six archaeological surveys, one architectural survey and one preliminary National Register of Historic Places (NRHP) evaluation. Approximately 3,560 acres of NWSTF Boardman have been surveyed for archaeological sites. Five prehistoric archaeological sites and 12 historic archaeological sites and/or features have been recorded on NWSTF Boardman. Additionally, 14 artifacts that represent evidence of Native American seasonal hunting or travel camps, inadvertent loss during travel or hunting/gathering activities, and food- and indulgence-related objects have been recorded.
An additional 1,700 acres were surveyed in March and May of 2011. The pedestrian and subsurface study was conducted in two phases, a pedestrian survey and a subsurface survey. The
pedestrian survey was conducted between March 23 and 29, 2011, to document the presence or absence of cultural resources visible at the ground surface within the project area and to provide preliminary assessments of the National Register of Historic Places (NRHP) eligibility for each identified resource. The subsurface phase of the survey was conducted between May 11 and 14, 2011, and examined select areas within the larger survey area, specifically the locations of the six cultural resources identified during the pedestrian phase of the survey and four areas deemed to have potential to contain subsurface archaeological deposits. As a result of the fieldwork, three historic-era archaeological sites and four historic-era isolates (discrete locales that contain fewer than ten cultural items) were identified and recorded. The resources contain sparse cultural material and were determined to most likely reflect the dominant economic activity and use of open rangelands in Morrow County in the later nineteenth and early part of the twentieth centuries, sheep husbandry.