Route 10A
Carrying Route 10A over Airport Drainage
0.5mi SE of Rte 10A/Rte 1, Unknown County, Guam
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
Route 10A in Unknown County, Guam sits above 47% of rated Guam bridges on inventory load rating (24 t), while its 1978 build year is earlier than 55% of Unknown County's recorded-year cohort (47 bridges).
Route 10A in Unknown County, Guam is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 1978, it carries 1 rated component on the inspecting agency's 0-9 scale, and its weakest reported component scores 7. The lowest applicable rating sets the federal condition category, so this Good 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 GU:66181000010G049
INTERSTATE-ERA · CONCRETE · MULTI-SPAN · CULVERT-LED · HEAVY-ADT · STANDARD-LOAD · CAT-GOOD
- INTERSTATE-ERA 1950–1979
- CONCRETE Concrete
- MULTI-SPAN 2 spans
- CULVERT-LED Culvert-led
- HEAVY-ADT Heavy ADT
- STANDARD-LOAD Standard load
- CAT-GOOD Good
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: Route 10A
The Route 10A bridge in Unknown County, Guam carries Route 10A over Airport Drainage. It was built in 1978, making it 48 years old today. The structure is built primarily of concrete and spans 2 sections, stretching 25.9 meters (85 feet) end to end. Daily traffic averages 19,999 vehicles, placing it in the heavily-trafficked tier of Guam bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show culvert at 7/9. The weakest component sits in good condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How Route 10A compares
Age against the county: built in 1978, earlier than 26 of Unknown County's 47 bridges with a recorded construction year (55%), against a county median build year of 1982. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Guam bridges with a recorded inventory load rating (45 of 47 rated).
Route 10A vs every rated Guam bridge
Inventory load rating (metric tons), FHWA NBI, this state
24 Top 53% higher than 47% of 45 bridges
rated Guam 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.
Unknown County inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 47 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
- 1978
- Material
- Concrete
- Number of Spans
- 2
- Structure Length
- 25.9 m (85 ft)
- Deck Width
- 35.1 m (115 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 19,999 vehicles/day
- Structure Number
- 66181000010G049
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 Route 10A 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 Route 10A against other structures in Unknown County and across Guam. Guam 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 Route 10A?
Route 10A in Unknown County, Guam on the FHWA's 0–9 scale.
How often is Route 10A inspected?
Route 10A'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 19,999 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. Route 10A is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for Route 10A?
Route 10A has an NBI inventory load rating of 24.0 metric tons.
Who is responsible for maintaining Route 10A?
Route 10A is owned and maintained by State Highway Agency.
How old is Route 10A and does age affect safety?
Route 10A was built in 1978, making it 48 years old.
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.