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Status – this field refers to individual federal and state program status: National Register, Study List, and Determined Eligible, or None of the above.
NR - Individual National Register listing – Blue circle. These are places listed to the National Register of Historic Places. Learn more about the process of listing resources to the Register, here.
NRD - National Register, Gone (whether the historic resource has been destroyed or moved to a new site) - Blue circle with black dot
NRHD - Center point of a National Register historic district – Blue star
SL - Individual Study List entry – Green square. These are places that the National Register Advisory Committee has identified as potentially eligible for the Register. Learn more about the Study List process, here.
SLD - Study List, Gone (whether the historic resource has been destroyed or moved to a new location) - Green square with black dot
SLHD – Center point for Study List historic district – Green star
DOE - Individual “Determination of Eligibility” in environmental review work – Orange triangle. Resource has been determined eligible under Section 106 of the National Historic Preservation Act of 1966. Learn more about our Environmental Review Branch and Section 106, here.
DOED - Determined eligible, Gone (whether the historic resource has been destroyed or moved to a new site) – Orange triangle with black dot
DOEHD – Center point of Determined eligible historic district. Orange star
SLDOE - BOTH on the Study List and Determined Eligible – Green triangle
SLDOED - Both SL and DOE, and Gone (whether the historic resource has been destroyed or moved to a new site) – Green triangle with black dot
SLDOEHD - Center point of district that is both SL and DOE – Olive star
SO - Surveyed Only. No individual designation, but may be within a National Register, Study List, or DOE district (see HDstatus, below) - Tan pentagon
SD - Surveyed only, Gone (whether the historic resource has been destroyed or moved to a new site) - Tan pentagon with black dot
BF - “Blockface”. A point marking an area where multiple properties were surveyed as a group, typically one or both sides of a block in a historic district - Tan cross
SA - Surveyed area. Center point of an area where several properties were surveyed together, typically a rural crossroads - Tan star |