Key Bridge (Round Who Knows But Probably Not Last)

[Beltway]

I mean, I guess you could argue that "national" isn't the exact same as "interstate and interregional".

The NHS definition in 23 USC 103 is extremely broad. It includes the entire Interstate System plus thousands of principal arterials that have no national freight, defense, or economic role.

That's why FHWA, BTS, MARAD, and Congress all use narrower classifications when determining national significance for funding purposes: PHFS, STRAHNET, INFRA/Mega eligibility, port‑dependency metrics, detour feasibility, and measured national‑level economic impact.

So yes, the Key Bridge corridor is on the NHS. But NHS membership by itself doesn't establish national significance in the statutory sense used for extraordinary federal cost shares or nationally significant freight projects.

My question remains the same:
Is there a federal designation -- PHFS, STRAHNET, INFRA/Mega, or similar -- that defines this corridor as nationally significant for funding purposes?

If there is, I'm open to reviewing it.

[The_Ginger]

I mean, I guess you could argue that "national" isn't the exact same as "interstate and interregional".

The NHS definition in 23 USC 103 is extremely broad. It includes the entire Interstate System plus thousands of principal arterials that have no national freight, defense, or economic role.

That's why FHWA, BTS, MARAD, and Congress all use narrower classifications when determining national significance for funding purposes: PHFS, STRAHNET, INFRA/Mega eligibility, port‑dependency metrics, detour feasibility, and measured national‑level economic impact.

So yes, the Key Bridge corridor is on the NHS. But NHS membership by itself doesn't establish national significance in the statutory sense used for extraordinary federal cost shares or nationally significant freight projects.

My question remains the same:
Is there a federal designation -- PHFS, STRAHNET, INFRA/Mega, or similar -- that defines this corridor as nationally significant for funding purposes?

If there is, I'm open to reviewing it.

At this point, we're all taking to straight AI.

[kphoger]

At this point, we're all taking to straight AI.

What?  No, his responses—other than a few months ago—do not sound like A.I. at all.  Try to refrain from throwing that accusation around as much as has been done in the recent past.

[Max Rockatansky]

At this point, we're all taking to straight AI.

What?  No, his responses—other than a few months ago—do not sound like A.I. at all.  Try to refrain from throwing that accusation around as much as has been done in the recent past.

The man did it himself though.  He got caught lying about using generative AI once and now is probably forever associated with it.

[Plutonic Panda]

Maryland officials confirming the 5.2 billion dollar price tag:

https://marylandmatters.org/2026/06/03/transportation-officials-hold-firm-on-5-2-billion-price-tag-to-replace-key-bridge/

[Beltway]

$5.2 billion is the number they're holding to, yes. But the part nobody ever addresses is the same question I've been asking since day one: where is that kind of money coming from?

And the second question is just as important: is it worth that kind of money?

We're talking about a single structure with a price tag larger than the entire annual capital program of many state DOTs. Before anyone declares $5.2 billion as "the number," we still haven't seen: a complete funding stack, a final design, a risk‑adjusted cost range, or any serious alternatives analysis.

Until those pieces exist, $5.2 billion is a placeholder, not a final cost -- and the value proposition hasn't been demonstrated.

[Rothman]

Yeah, well, you know, that's just, like, your opinion, man.

[Plutonic Panda]

$5.2 billion is the number they're holding to, yes. But the part nobody ever addresses is the same question I've been asking since day one: where is that kind of money coming from?

Probably from a printer like all the other money.

[vdeane]

I know that they're deferring at least one project until the Key Bridge replacement project is finished - the toll booth removal on I-895.

[GaryV]

that's just, like, your opinion

"When I want your opinion, I'll ask AI to generate it for me."

[PColumbus73]

If he thinks a bridge is expensive... wait 'til they price out a tunnel...

[Beltway]

The cost of a Baltimore Outer Harbor tunnel isn't hypothetical -- we have hard precedent. VDOT is delivering a 7,900‑ft twin‑tube tunnel at HRBT for $1.9 billon, and CBBT's 6,100‑ft Thimble Shoal tunnel is under construction for $780 million, both in the same coastal geology. With the 1970 Baltimore tunnel portals already built, a 6,200‑ft twin‑tube Outer Harbor tunnel pencils out at $1.6–$1.9 billion, which is less than one‑third of the new bridge estimate.

Even if you inflate those numbers another 20–25%, a 6,200‑ft Baltimore Outer Harbor tunnel still lands around $2.0–$2.3 billion.

[Rothman]

If he thinks a bridge is expensive... wait 'til they price out a tunnel...

Keyword is "they," but then there's the HAZMAT issue, for which I will defer to their opinion rather than "his."

[Beltway]

Modern tunnels are HAZMAT‑capable when built to NFPA‑502 standards. Maryland's insistence on a bridge isn't about engineering or routing; it's an emotional and political preference, not a technical requirement.

[Max Rockatansky]

The continuation of these threads when where really isn't any significant news is an emotional preference. 

[bwana39]

If he thinks a bridge is expensive... wait 'til they price out a tunnel...

Keyword is "they," but then there's the HAZMAT issue, for which I will defer to their opinion rather than "his."

At this price point, allowing only hazmat through on alternating 15-minute periods would be a better choice.

[Beltway]

Here's some additional background on the original Outer Harbor Crossing plan, which predates the 1972–77 Key Bridge contract.

The first concept was a single‑tube, two‑lane, 6,200‑foot harbor tunnel with long approach causeways built in advance to reach the portals. The two‑lane freeway was placed under construction, and the tidal‑water causeways were completed between 1968 and 1970. When the tunnel contract was advertised on July 30, 1970, the bids came in high enough that the State Roads Commission determined a four‑lane high‑level bridge could be built for roughly the same cost as the revised tunnel estimate.

The long approach causeways -- about 1.1 miles on the north side and roughly 3,000 feet on the south -- were not part of the later Key Bridge contract. They were advance earthwork for the earlier tunnel concept and required placing large volumes of imported borrow fill directly into tidal water. The Patapsco bottom in this area consisted of soft organic sediments similar to the "black mayonnaise" later encountered on the Fort McHenry Tunnel project, so the work used containment berms, staged lifts, settlement allowances, wide embankment bases, and heavy riprap along both shorelines.

Material sourcing reflected the site conditions. On the south side, a large upland sand pit only about 3,000 feet from the alignment almost certainly supplied most of the fill. On the north side, where no borrow pits existed, the contractor would have barged sand across the Patapsco and placed it behind temporary berms -- a standard Maryland method for tidal embankments of that era. This allowed the mile‑long north causeway to be built entirely on soft tidal soils without relying on long‑haul trucking or unstable temporary access roads.

No published contract cost survives, but the geometry and construction methods indicate a major earthwork and shoreline‑protection job involving roughly 1.0–1.3 million cubic yards of placed material and costing on the order of $2.2–$2.5 million in 1968 dollars (about $18–$22 million today).

The bridge approach spans were built on the causeways.

I found a photo of the construction online.