Eolia (The Harkness Estate) is a Renaissance Revival estate in Waterford, Connecticut. Built in 1907, it was designed by Lord & Hewlett, and is listed on the U.S. National Register of Historic Places. It is owned by State of Connecticut.
Location: 275 Great Neck Road, Waterford, Connecticut, United States
Verified facts
- Located in Goshen Point, Waterford
confidence 70/100 · 2 recorded source groups · SRC-1589, SRC-1590 - Designed by Lord & Hewlett
confidence 80/100 · 4 recorded source groups · SRC-1589, SRC-1591, SRC-6246, SRC-6247 - Built in 1907
confidence 80/100 · 4 recorded source groups · SRC-1589, SRC-1591, SRC-6248, SRC-6246 - Architectural style: Renaissance Revival
confidence 75/100 · 3 recorded source groups · SRC-1589, SRC-1591, SRC-3709 - Historic designation: National Register of Historic Places
confidence 75/100 · 3 recorded source groups · SRC-1589, SRC-1590, SRC-1591
Ownership history
Current owner — State of Connecticut
confidence 85/100 · SRC-1589, SRC-1590, SRC-3709
Evidence & sources
- SRC-1589 — National Register of Historic Places Inventory-Nomination Form: Eolia-The Harkness Estate (NRHP ref. 86003331) (Tier 1, official_archive; retrieved June 2026)
- SRC-1590 — Harkness Memorial State Park – Connecticut Department of Energy and Environmental Protection (Tier 1, official_archive; retrieved June 2026)
- SRC-1591 — Harkness Memorial State Park – Wikipedia (Tier 3, encyclopedia; retrieved June 2026)
- SRC-3709 — ct.gov (Tier 1, official_primary; retrieved June 2026)
- SRC-5593 — Historic Barns of Connecticut (Connecticut Trust for Historic Preservation) — Harkness Memorial State Park (Tier 2, reference; retrieved June 2026)
- SRC-6246 — Connecticut DEEP — Harkness Memorial State Park, History and Restoration (Tier 2, state government; retrieved June 2026)
- SRC-6247 — Buildings of New England — Harkness Estate, Eolia Mansion // 1908 (Tier 3, architectural history blog; retrieved June 2026)
- SRC-6248 — ArtGeek — Eolia, The Mansion at Harkness State Park (Tier 3, museum directory; retrieved June 2026)
How we verify
The entries above show the sources and confidence scores recorded in our fact ledger.
Source tiers are internal classifications, not guarantees of accuracy or independence.
Several sources may repeat the same underlying account; a source count alone does not establish independent corroboration. We show the
street address only for non-residential public landmarks (museums, commercial and civic buildings,
publicly documented filming-location sites); the exact addresses of private residences and any
personal information are structurally barred from publication. Last reviewed June 2026.
Plan Your Visit
Hours: Park open daily 8am-sunset. Eolia Mansion & gardens guided tours weekends/holidays Memorial Day-Labor Day, 10am-2pm (last tour 1:30pm); groups by appointment.
Admission: Park entry free for CT-registered vehicles; $10-$15 out-of-state vehicles (Memorial Day-Labor Day). Mansion docent tours offered by Friends of Harkness.
Frequently asked questions
Can you visit Eolia (The Harkness Estate)?
Yes — Eolia (The Harkness Estate) is open to the public on a limited basis. Hours: Park open daily 8am-sunset. Eolia Mansion & gardens guided tours weekends/holidays Memorial Day-Labor Day, 10am-2pm (last tour 1:30pm); groups by appointment.. Admission: Park entry free for CT-registered vehicles; $10-$15 out-of-state vehicles (Memorial Day-Labor Day). Mansion docent tours offered by Friends of Harkness..
Who designed Eolia (The Harkness Estate)?
Eolia (The Harkness Estate) was designed by Lord & Hewlett.
Where is Eolia (The Harkness Estate) located?
Eolia (The Harkness Estate) is located in Waterford, Connecticut.