Whidbey Island-Hat Island: A Short Submarine Link in Washington State
The Whidbey Island-Hat Island submarine cable is a 4-kilometer fiber optic system connecting
Clinton on Whidbey Island to
Hat Island, both located in Washington State, United States. Owned by Whidbey Telecom, it has been listed as in service since 1999 according to GeoCables records. While short in length, this cable plays a role in providing connectivity to Hat Island, a small residential community.
What stands out about this cable is its limited public documentation. Key technical details such as design capacity, fiber pair count, supplier, and technology are not disclosed, making it difficult to assess its full capabilities or compare it to other regional systems. Its short distance suggests minimal latency over the wet segment, but real-world performance data is unavailable.
Quick facts
| Name | Whidbey Island-Hat Island |
| Length | 4 km |
| Ready for Service | 1999 (GeoCables database) |
| Owner | Whidbey Telecom |
| Status | In service |
| Design Capacity | Not disclosed |
| Fiber Pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing Points | Clinton (United States); Hat Island (United States) |
| Other cables at Clinton | Whidbey Island-Everett |
Route
The cable spans a short distance across Puget Sound, connecting Clinton, a community on the southern tip of Whidbey Island, to Hat Island, a small private island located southeast of Whidbey Island. Hat Island is primarily residential and accessible by private ferry, making the cable an important infrastructure component for its residents. The geography of the corridor is characterized by calm waters, which likely simplified the cable's installation and maintenance compared to longer or more exposed routes.
Why it was built and what it carries
The Whidbey Island-Hat Island cable was most likely built to provide reliable telecommunications services to Hat Island, which lacks direct road or bridge access to the mainland. As a private island with limited infrastructure, connectivity via submarine cable ensures access to internet, voice, and potentially other data services. Whidbey Telecom, the cable's owner, is a local telecom provider serving Whidbey Island and surrounding areas, suggesting a focus on regional connectivity rather than large-scale international traffic.
History: what can be established
GeoCables records indicate the cable became ready for service in 1999. Public sources do not provide alternative dates, nor do they elaborate on the circumstances of its construction or commissioning. It is unclear whether the cable was part of a broader infrastructure upgrade by Whidbey Telecom or a standalone project to serve Hat Island. Without further documentation, the motivations and timeline behind its deployment remain speculative.
Capacity and technology
The design capacity and fiber pair count of the Whidbey Island-Hat Island cable are not publicly disclosed. Similarly, no information is available about its supplier or the specific technology used in its construction. Given its short length, the cable likely uses straightforward engineering solutions typical of regional submarine systems, but attributing specific technical details without operator documentation would be speculative.
Latency: the physics
The computed one-way light propagation latency over the 4-kilometer wet segment is effectively 0.0 milliseconds, with a theoretical round-trip time (RTT) floor also close to 0.0 milliseconds. However, real-world latency is higher due to the inclusion of land tails, terminal equipment delays, and routing overhead. No live measurements are available for this cable, and any attempt to quantify its end-to-end latency without direct data would be conjecture.
Redundancy: what happens if it breaks
In the event of a failure, redundancy options for Hat Island are limited. The cable's landing point at Clinton also hosts the Whidbey Island-Everett cable, which connects Whidbey Island to the mainland. However, this alternative does not directly serve Hat Island, meaning residents would likely rely on wireless or satellite solutions during an outage. Repair logistics for a short cable like this are typically straightforward, involving localized vessel operations and minimal disruption compared to longer international systems.
Bottom line
- The Whidbey Island-Hat Island cable is a 4-kilometer submarine system connecting Clinton and Hat Island in Washington State.
- Owned by Whidbey Telecom, it has been listed as in service since 1999.
- Key technical details such as design capacity and fiber pair count are not disclosed in public sources.
- Its short length results in negligible wet-segment latency, but real-world performance data is unavailable.
- Redundancy options for Hat Island are limited, with repair logistics likely straightforward due to the cable's short length.