| Biggs site 15 Gp 8 | |
| Map Type: | USA Kentucky |
| Coordinates: | 38.7341°N -82.9344°W |
| Location: | South Shore, Kentucky, Greenup County, Kentucky,  United States |
| Region: | Greenup County, Kentucky |
| Cultures: | Adena culture, Ohio Hopewell culture |
| Architectural Styles: | earthworks, causewayed ring ditch |
| Notes: | Responsible body: private |
| Precolumbian: | yes |
The Biggs site (15Gp8), also known as the Portsmouth Earthworks Group D, is an Adena culture archaeological site located near South Shore in Greenup County, Kentucky. Biggs was originally a concentric circular embankment and ditch surrounding a central conical burial mound with a causeway crossing the ring and ditch. It was part of a larger complex, the Portsmouth Earthworks located across the Ohio River, now mostly obliterated by agriculture and the developing city of Portsmouth, Ohio.[1]
The site was surveyed and mapped by E. G. Squier in 1847 for inclusion in the seminal archaeological and anthrolopological work Ancient Monuments of the Mississippi Valley. They described the earthwork as being a causewayed embankment 5feet high by 30feet wide encircling a ditch 6feet deep and 25feet across. They encircled an area 90feet in diameter. In the center of the ditch was a conical tumulus 8feet high and 40feet in diameter.[2]