Exact federal listing answer
Is Riordan Estate on the National Register?
Yes · NPS status: Listed
Yes. Reference 79000416 is listed.
Yes. The U.S. National Park Service listed-properties dataset through May 22, 2026 identifies Riordan Estate as Listed in the National Register of Historic Places under reference 79000416.
Federal statusListed
National Register reference79000416
Listed dateFebruary 28, 1979
Property categoryBuilding
Published address2 Kinlichi Knoll
LocalityFlagstaff, Coconino County, Arizona
Significance levelNational
Published acreage5
Exact answer boundaryThis confirms the named federal record only.
It does not prove that another address lies inside this property or district, establish local landmark status, decide preservation review, define a legal boundary, or describe ownership or current condition.
Why the wording is date-boundedThe answer reflects the NPS dataset published through May 22, 2026 and a live NPS GIS Listed-status cross-check made September 20, 2026. NPS notes that spatial points and polygons may need correction and are not legal documents.
Additional published fields
Areas of significance: INDUSTRY, ARCHITECTURE.
Other published names: Kinlichi Knoll.
Same locality
Other released Flagstaff records.
Each linked page answers a separate named federal record.