Marietta Earthworks
Marietta Complex · Muskingum-Ohio Confluence Works
Middle Woodland Hopewell (100 BCE–500 CE)·Hopewell (Marietta phase)·🇺🇸 Ohio, Washington County, United States
About
About Marietta Earthworks
Hopewell ceremonial complex (100 BCE–500 CE) at confluence of Muskingum and Ohio Rivers, originally three enclosures: Capitolium Square (150×110 m terraced platform and graded way), Quadranaou double circle-square, and larger Sacra Via stepped causeway 350 m long × 45 m wide descending to Muskingum floodplain with parallel embankments 3.6 m high. Now largely overlain by modern Marietta; Sacra Via and Capitolium preserved as parks (Washington County Public Library mound). Conical Centro-Mound (5 m) and six smaller burial mounds in cemetery preserve Hopewell funerary sequence.
Why it mattersOnly Hopewell complex fully integrated with river confluence; Sacra Via is largest earthen causeway north of Mexico; early Squier-Davis prime illustration.
Open questions
Mysteries & theories
Mysteries
- 01Alignment of Sacra Via to solstice sunrise over Ohio River
- 02Why Capitolium built as terraced platform vs circle
Theories
- 01Confluence pilgrimage center controlling river trade
- 02Chiefly redistribution center with causeway as processional avenue
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- c.100 BCE–400 CE
- Period
- Middle Woodland Hopewell (100 BCE–500 CE)
- Culture
- Hopewell (Marietta phase)
- Purpose
- Ceremonial center and causeway town marking sacred confluence
- Excavation
- Partially excavated
c.100 BCE–400 CE
Initial construction
c. 1154 CE
Major expansion
On the ground
Structures & features
39.4200° N · 81.4519° W · 190 m · 2 mapped features
Sacra Via (Via Sacra)
causeway350 m long graded ramp 45 m wide with 3.6 m flank walls descending to Muskingum
39.4192° N · 81.4525° WCapitolium Platform
platform mound150×110 m Hopewell square platform (library park)
39.4210° N · 81.4500° W