| Location | New Haven, Connecticut |
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| Year first constructed | 1877 |
| Year first lit | 1877 |
| Automated | 1973 |
| Foundation | Cast Iron and Concrete Caisson |
| Construction | Cast Iron |
| Tower shape | Octagonal |
| Markings / pattern | White tower on brown pier |
| Focal height | 57 ft (17 m) |
| Original lens | Fourth order Fresnel lens |
| Current lens | VRB-25 system |
| Range | 14 nm |
| Characteristic | red flash every 5s |
| Fog signal | Horn: 1 every 15s |
| ARLHS number | USA-778 |
| USCG number | 1-21210 |
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Southwest Ledge Lighthouse
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| Nearest city: | New Haven, Connecticut |
| Area: | less than one acre |
| Built: | 1876 |
| Architect: | Elliot,Maj. George H. |
| Architectural style: | Second Empire |
| Governing body: | US Coast Guard |
| MPS: | Operating Lighthouses in Connecticut MPS |
| NRHP Reference#: | 89001475[3] |
| Added to NRHP: | May 29, 1990 |
Southwest Ledge Light is a lighthouse in New Haven, Connecticut. United States, on the reef at main entrance to New Haven Harbor. It was one of the first to be built on a cylindrical iron foundation, an innovation by Maj. George H. Elliot to address shifting ice that is regarded to be very important in lighthouse design.[4]:3
Construction on the Southwest Ledge Lighthouse started in 1873 and was finished in 1877. The lighthouse superstructure was on display at the Philadelphia Exposition of 1876 before being installed.[4]
The lighthouse was automated in 1973.
The lighthouse was listed on the National Register of Historic Places in 1990 as Southwest Ledge Lighthouse.[3][4]
The lighthouse is currently an active aid to navigation.
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