Fort Mifflin
Built 1771 by John Montresor. Added to the National Register in 1970, and a National Historic Landmark.
The record
| Property type | Historic district |
| Address | Marina and Penrose Ferry Rds., Philadelphia, PA |
| County | Philadelphia County |
| Listed | Aug 29, 1970 |
| Listed for | Military, Engineering |
| Level of significance | National |
| Also known as | Mud Island Fort; Old Fort Mifflin |
| Reference number | 70000554 |
| Built | 1771 · more from the 1770s |
| Architect | John Montresor |
| Designations | National Historic Landmark, Pennsylvania state historical marker |
The nomination form, the document that argues why this place matters, is in the National Archives: Read the nomination ↗
Visiting
| Address | Marina and Penrose Ferry Rds., Philadelphia, PA |
| Coordinates | 39.8753° N, 75.2130° W · Directions ↗ |
| Also in Philadelphia | 632 listed places in Philadelphia → · walking tours → |
Explore
Map
Nearby in Philadelphia County
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Public land around it
| John Heinz National Wildlife Refuge at Tinicum ↗National Wildlife Refuge, U.S. Fish and Wildlife Service | About 3 miles away998 acres |
Wilderness Atlas publishes a centroid and an acreage for each unit, not a boundary line. Distance here is measured to a circle of the same area drawn around that centroid, so treat it as roughly right rather than surveyed.
Local history books for Philadelphia
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Guidebooks to historic places in Pennsylvania
Titles come from Open Library's catalog, matched by subject heading or by title.
Reference
Questions people ask
When was Fort Mifflin listed on the National Register?
Aug 29, 1970. It is also a National Historic Landmark, the higher of the two designations.
Source: National Park Service
When was Fort Mifflin built?
1771, designed by John Montresor.
Source: Wikidata
Where is Fort Mifflin?
Marina and Penrose Ferry Rds., Philadelphia, Philadelphia County, Pennsylvania.
Source: National Park Service
Where is the nomination form for Fort Mifflin?
The National Archives holds the nomination form, the document that made the case for listing.
Source: National Archives
Sources
Name, location, type and dates come from the National Register office's spreadsheet of listed properties, because the Park Service's spatial data does not carry this listing. The map point comes from Wikidata. Construction date, architect, style, photograph and encyclopedia link come from Wikidata and Wikimedia Commons, matched on reference number 70000554. Nothing here is transcribed by hand. The nomination form and photographs ↗ at NPGallery are the original nomination as filed with the National Park Service, and the form is often the best description of the place.