Route 10A
Carrying Route 10A over Route 16
.8mi S of RTE16 n RTE27, 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 82% of rated Guam bridges on inventory load rating (34 t), while its 2000 build year is earlier than 9% of Unknown County's recorded-year cohort (47 bridges).
Route 10A in Unknown County, Guam is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 2000, 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 GU:66181000010G034
POST-2000 · PRESTRESS · SINGLE-SPAN · TIED-CTRL · HEAVY-ADT · STANDARD-LOAD · CAT-FAIR
- POST-2000 2000+
- PRESTRESS Prestressed concrete
- SINGLE-SPAN Single span
- TIED-CTRL Tied control
- HEAVY-ADT Heavy ADT
- STANDARD-LOAD Standard 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: Route 10A
The Route 10A bridge in Unknown County, Guam carries Route 10A over Route 16. It was built in 2000, making it 26 years old today. The structure is built primarily of prestressed concrete and spans 1 section, stretching 20.4 meters (67 feet) end to end. Daily traffic averages 26,400 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 a deck rating of 6/9, superstructure at 6/9, substructure at 7/9. The weakest component sits in fair 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 2000, earlier than 4 of Unknown County's 47 bridges with a recorded construction year (9%), against a county median build year of 1982. This is one of the newer structures in its county.
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
34 Top 18% higher than 82% 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.
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.
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
- 2000
- Material
- Prestressed Concrete
- Number of Spans
- 1
- Structure Length
- 20.4 m (67 ft)
- Deck Width
- 42.7 m (140 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 26,400 vehicles/day
- Structure Number
- 66181000010G034
Condition Analysis
- • The deck (driving surface) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The superstructure (beams and supports above the deck) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • At 7/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
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 has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 7/9 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 26,400 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 Fair 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 34.0 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 2000, making it 26 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.