Geological age ~450 million years ago (Ordovician bedrock); floodplain deposits Holocene.
Epoch Ordovician period (Cincinnatian); overlain by Quaternary glacial outwash and Holocene alluvium; site lies on Little Miami River floodplain shaped by Wisconsin glaciation meltwater.
Native lands Shawnee (Shawanwaki) · Fort Ancient culture (900-1650 CE); Little Miami River a principal Shawnee corridor; Shawnee ceded Ohio lands via Treaty of Greene Ville 1795.
Displacement & Tenure Cession 11: Treaty of Greene Ville (1795); the Little Miami floodplain site remained largely undeveloped due to periodic flooding; the park was funded through the Otto Armleder Trust, established by the 1935 will of Cincinnati businessman Otto Armleder (1862 to 1935), directing his estate toward charitable and civic projects in Hamilton County.
Shadow History Ohio EPA and USGS assessments of the Little Miami basin have documented elevated trace elements and synthetic organic compounds including organochlorine insecticides and PCBs in streambed sediments downstream of Cincinnati's industrial corridor; no Superfund listing specific to the Armleder floodplain section appears in EPA records; the park's floodplain location, which prevented prior development and made acquisition relatively inexpensive, reflects the same industrial contamination history that kept the land undeveloped.
Ecology Floodplain wetland; bottomland hardwood forest; willow, cottonwood, silver maple, boxelder; critical migratory bird stopover on the Ohio flyway; 76+ documented bird species.
Hydrology Little Miami River floodplain; subject to periodic inundation; adjacent to Lunken Airfield oxbow; Mill Creek watershed confluence nearby.
Acreage 347 acres
GPS 39.1020° N, 84.4280° W
Otto Armleder Memorial Park I · 2025-08-26
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Public Lands Institute — ongoing project
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