US 1 ALT
Carrying US 1 ALT over ANACOSTIA RIVER
0.05 MILE SOUTH OF MD 450, Prince George's, Maryland
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
US 1 ALT in Prince George's, Maryland sits above 48% of rated Maryland bridges on inventory load rating (44 t), while its 1955 build year is earlier than 84% of Prince George's's recorded-year cohort (576 bridges).
US 1 ALT in Prince George's, Maryland is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1955, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure MD:100000160008010
INTERSTATE-ERA · STEEL · MULTI-SPAN · SUB-LED · HEAVY-ADT · HEAVY-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- MULTI-SPAN 3 spans
- SUB-LED Substructure-led
- HEAVY-ADT Heavy ADT
- HEAVY-LOAD Heavy load
- CAT-FAIR Fair
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: US 1 ALT
The US 1 ALT bridge in Prince George's, Maryland carries US 1 ALT over ANACOSTIA RIVER. It was built in 1955, making it 71 years old today. It was last reconstructed in 2006, extending its service life. The structure is built primarily of steel continuous and spans 3 sections, stretching 83.8 meters (275 feet) end to end. Daily traffic averages 22,252 vehicles, placing it in the heavily-trafficked tier of Maryland bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 8/9, superstructure at 7/9, substructure at 6/9. The weakest component sits in fair condition. All reported major components score above the Poor range.
How US 1 ALT compares
Age against the county: built in 1955, earlier than 481 of Prince George's's 576 bridges with a recorded construction year (84%), against a county median build year of 1971. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Maryland bridges with a recorded inventory load rating (5,479 of 5,484 rated).
US 1 ALT vs every rated Maryland bridge
Inventory load rating (metric tons), FHWA NBI, this state
44 Top 52% higher than 48% of 5,479 bridges
rated Maryland bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Prince George's inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 576 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1955
- Last Reconstructed
- 2006
- Material
- Steel Continuous
- Number of Spans
- 3
- Structure Length
- 83.8 m (275 ft)
- Deck Width
- 21.5 m (71 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 22,252 vehicles/day
- Structure Number
- 100000160008010
Condition Analysis
- • At 8/9, the deck (driving surface) is in good shape and shows no significant wear.
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • The substructure (piers and abutments) rates fair at 6/9, minor deterioration that routine maintenance should address.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether US 1 ALT is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare US 1 ALT against other structures in Prince George's and across Maryland. Maryland bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for US 1 ALT?
US 1 ALT in Prince George's, Maryland has a deck rating of 8/9, superstructure rating of 7/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is US 1 ALT inspected?
US 1 ALT's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 22,252 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. US 1 ALT is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for US 1 ALT?
US 1 ALT has an NBI inventory load rating of 44.0 metric tons.
Who is responsible for maintaining US 1 ALT?
US 1 ALT is owned and maintained by State Highway Agency.
How old is US 1 ALT and does age affect safety?
US 1 ALT was built in 1955, making it 71 years old and last reconstructed in 2006.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.