The Continental Divide: How US Relay Infrastructure Quietly Concentrates Power at the Coasts

Draw a map of major US relay network nodes and cloud interconnection points, and a pattern emerges almost immediately. Capacity clusters around Northern Virginia, the San Francisco Bay Area, the Chicago metro corridor, and, to a lesser extent, the Dallas–Fort Worth region. These are not arbitrary concentrations. They reflect decades of investment decisions shaped by fiber availability, real estate economics, power grid density, and proximity to existing hyperscaler infrastructure. They also reflect, whether intentionally or not, a systematic deprioritization of the interior.

For distributed relay networks designed to provide continental resilience, this geography is not merely an inconvenience. It is a structural vulnerability that conventional network planning frameworks consistently underweight.

Where the Capacity Actually Lives

The asymmetry is measurable. Independent analyses of public peering data and colocation density consistently show that the majority of US relay interchange capacity — the physical and logical points where distributed networks exchange traffic and coordinate routing — sits within roughly 150 miles of either coastline or within the Chicago corridor that connects them. The Mountain West, the Great Plains, and the Southeast outside of Atlanta receive a fraction of that density relative to the populations and enterprise infrastructure they serve.

This matters for relay networks in a specific and underappreciated way. When a distributed grid is designed with the implicit assumption that most of its high-capacity relay nodes are coastal, routing logic optimizes accordingly. Traffic from inland regions — say, a manufacturing operation in Omaha or a financial services firm in Kansas City — travels east or west to reach a high-capacity relay point before being distributed onward. That routing path introduces latency, creates dependency on long-haul fiber corridors, and concentrates failure risk at the coastal interchange nodes.

In normal operating conditions, this architecture functions adequately. In degraded conditions — a major weather event along the Gulf Coast, a power disruption in Northern Virginia's data center corridor, a fiber cut along a transcontinental route — the inland network's dependency on distant relay capacity becomes immediately apparent.

The Economic Logic Behind the Geography

Understanding why this asymmetry exists requires understanding the economic incentives that govern relay network investment. Colocation facilities and relay interchange points are capital-intensive assets. Their operators require predictable, high-volume traffic to justify construction and ongoing operational costs. That traffic density exists, reliably, in coastal metros and the Chicago corridor — because that is where the hyperscalers built their primary regions, where enterprise headquarters cluster, and where submarine cable landing stations terminate.

Inland deployments, by contrast, face a chicken-and-egg problem. Without existing relay density, major network operators have limited incentive to invest in inland capacity. Without inland capacity, the routing economics that would attract anchor tenants and traffic volume never materialize. The result is a self-reinforcing concentration pattern that has deepened over each successive wave of data center construction.

Federal broadband investment programs have addressed last-mile connectivity in rural areas with some success, but they have largely not addressed the mid-tier relay infrastructure that connects regional networks to the distributed grid. That gap remains substantially unfilled by market forces alone.

What Asymmetry Looks Like During a Failure Event

The practical consequences of coastal concentration become visible during regional disruption events. When severe weather impacts the Virginia data center corridor — a recurring pattern given the region's exposure to hurricane-adjacent storm systems — relay networks with high coastal dependency experience disproportionate degradation even for traffic that originates and terminates entirely in the interior of the country.

This happens because the routing tables were optimized for the normal-state architecture, where coastal relay nodes handle the heavy lifting of traffic coordination. When those nodes become congested or unavailable, interior nodes that lack sufficient peering relationships and local relay capacity cannot absorb the rerouted load. The result is not a clean failover to inland infrastructure. It is a period of elevated latency, routing instability, and packet loss that persists until coastal capacity is restored.

For operators of distributed relay grids with national coverage obligations, this failure mode represents a significant gap between the resilience their architecture appears to provide and the resilience it actually delivers under stress.

Designing for the Interior

Addressing coastal concentration in relay network architecture requires deliberate counter-economic investment — placing relay capacity in locations where the immediate traffic economics do not fully justify it, in order to build the redundancy and routing diversity that true continental resilience demands.

Several approaches have demonstrated practical value. Distributed relay operators who have invested in anchor nodes in secondary markets — Denver, Minneapolis, Salt Lake City, Memphis — report meaningfully improved routing diversity and reduced dependency on coastal interchange paths. These nodes do not need to match the capacity of coastal facilities. Their value lies in providing alternative routing paths and local traffic absorption that reduce the blast radius when coastal infrastructure is stressed.

Equally important is the revision of routing logic to actively utilize inland relay paths rather than treating them as fallback options. Many distributed grids configure their routing tables to prefer low-latency coastal paths under all conditions, activating inland routes only after primary paths degrade past a threshold. This sequencing means inland capacity sits underutilized during normal operations, which reduces the economic justification for expanding it — reinforcing the original asymmetry.

A Resilience Standard Worth Reconsidering

The distributed relay networks that serve US enterprise and public sector infrastructure are, in aggregate, more vulnerable to coastal disruption than their nominal redundancy specifications suggest. That vulnerability is not a product of negligence. It is a product of investment incentives that have consistently rewarded density over distribution.

Building genuine continental resilience into relay grid architecture means accepting that some capacity must be placed where the economics are marginal, because the alternative — a national network that quietly depends on a handful of coastal interchange points — is a resilience posture in name only.