Etna Furnace (Boundary Increase)
Also known as: Mount Etna Furnace; Aetna Furnace; Aetna Iron Works; See Also:E
Why it's listed
Along Roaring Run near the Frankstown Branch of the Juniata River, the Etna Furnace plantation includes a charcoal iron furnace begun in 1808 and a range of stone and log buildings from the 1830s. David Stewart built a gristmill here in 1793, and the cold-blast furnace went into blast in 1808. Henry S. Spang acquired the works in 1823 and expanded production after the Juniata Division of the Pennsylvania Main Line Canal opened in 1832, raising output to 1,200 tons of pig iron a year by 1842. The ironmaster's house, dated 1832, has an ashlar front and coursed fieldstone sides. Surviving workers' houses, a tenant house, a bank barn and canal locks show how the plantation was organized. The nomination regards the group as a rare, well-preserved example of an iron plantation and as a source of information on ironmaking, canal construction and community life.
Significance in brief: The nomination argues the complex is the most intact iron plantation of the Juniata Valley iron industry and a representative example of the spread of Pennsylvania ironmaking. It is also cited for community planning, with buildings oriented first to the works and later to the canal, and for architecture, including the ironmaster's house and rare log workers' houses. Archaeological potential is noted in the canal remains, furnace area and building sites.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 91001145, listed September 6, 1991. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence medium).
Key facts
| Address | Roughly, area S and E of Frankstown Br. Juniata R. bend at Mt. Etna, Catherine Township, Mt. Etna |
|---|---|
| County | Blair County |
| Listed | September 6, 1991 |
| Reference number | 91001145 |
| Resource type | District |
| Period of significance | 1808-1874 |
| Criteria |
|
| Areas of significance | Industry, Community Planning and Development, Historic - Non-Aboriginal, Architecture |
| Level of significance | State |
| Status (as stated in the nomination) | The manager's house is described as vacant and deteriorating; the furnace was stabilized in 1989 with a temporary roof; the tenant house remains in residential use. |
| Acreage | 105 |
| Coordinates | 40.52077, -78.17427 (NPS GIS) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 91001145.
- Nomination form (PDF, National Archives) — catalog entry
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.