US Bridges

US 1 Alt over US1 Nbr AMTRAK Herbert

Fair

Baltimore County, Maryland · 1.40 MI S of Is 695 · Structure no. 100000030011010

Built
1936
89 years old, rebuilt 1980
Condition
Fair
inspected March 2024
Type
Girder and Floorbeam System
Steel
Length
540 ft
5 main spans
Daily traffic
19,195
2024 count
Owner
State
State Highway Agency

About this bridge

US 1 Alt over US1 Nbr AMTRAK Herbert is a steel girder and floorbeam system carrying US 1 Alt over US1 Nbr AMTRAK Herbert in Baltimore County, Maryland. It was built in 1936 and reconstructed in 1980, so it is 89 years old, older than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 19,195 vehicles a day, roughly 8% of them trucks, projected to reach 22,781 by 2044. The structure is 540 ft (164.6 m) long and 59 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 1 Alt
CrossesUS1 Nbr AMTRAK Herbert
Location1.40 MI S of Is 695
RouteU.S. Route 1
CountyBaltimore County
StateMaryland
Coordinates39.22974, -76.69246
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating34.9 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length540 ft (164.6 m)
Longest span137 ft (41.8 m)
Deck width59 ft (18 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,195 (2024)
Projected traffic22,781 by 2044
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway, waterway and railroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 1 Alt over US1 Nbr AMTRAK Herbert built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1980.

What condition is US 1 Alt over US1 Nbr AMTRAK Herbert in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2024.

How much traffic does US 1 Alt over US1 Nbr AMTRAK Herbert carry?

About 19,195 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is US 1 Alt over US1 Nbr AMTRAK Herbert?

The structure is 540 ft (164.6 m) long with a longest span of 137 ft (41.8 m) and a deck 59 ft wide.

Who owns US 1 Alt over US1 Nbr AMTRAK Herbert?

It is owned by the State Highway Agency.