Whaleback Shell Midden

🏆🏆🏆🏆🏆 2,200-Year-Old Oyster Feast — Largest prehistoric shell midden on the Maine coast — 2,200 years of Native oyster harvesting preserved in a 30-foot pile of shells

Whaleback Shell Midden State Historic Site in Damariscotta preserves the remains of a massive prehistoric shell heap — one of the largest oyster shell middens ever documented in North America. The midden was once 30 feet tall and contained oyster shells accumulated over 2,200+ years by the Abenaki and their ancestors. The enormous oysters (up to 16 inches long — 4x today’s size!) demonstrate that the Damariscotta River was once one of the world’s most productive oyster grounds. Tragically, 19th-century farmers mined most of the midden for chicken feed and road fill.

Visitor Information

Frequently Asked Questions

Why were the oysters so much bigger?

Before modern harvesting, oysters in the Damariscotta River had decades to grow, reaching 16 inches — far larger than today’s commercially harvested 3–4 inch oysters. The river’s unique tidal flow and nutrient mix created ideal growing conditions that have since been disrupted by development and overharvesting.

Insider Tips

Ancient feast: Whaleback Shell Midden is a massive pile of oyster shells — the remains of 1,000+ years of Native American feasting on Damariscotta River oysters. Pro tip: The middens once stood 30 feet high — most were quarried for chicken feed and road material in the 1800s (a tragic loss of archaeological heritage). Giant oysters: The ancient Damariscotta oysters grew to enormous sizes — 12 inches or more — in the river’s nutrient-rich waters.

Best Time to Visit

Summer: Interpretive programs and river views. Fall: Comfortable visiting. Year-round: Midden accessible. Spring: River setting.

Frequently Asked Questions

What is a shell midden?

A shell midden is an archaeological deposit of discarded shells — evidence of ancient shellfish harvesting. The Whaleback Midden accumulated over 1,000+ years of oyster harvesting by the Abenaki and their ancestors. The shells reveal information about ancient diet, climate, and marine ecology. Sadly, 90% of the Damariscotta middens were destroyed in the 1800s by quarrying for fertilizer and road material — before archaeologists recognized their significance.