GRAVINA ISLAND HWY
Carrying GRAVINA ISLAND HWY over GRAVINA CREEK
MILE POINT 2.1, Ketchikan Gateway, Alaska
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
GRAVINA ISLAND HWY in Ketchikan Gateway, Alaska sits above 72% of rated Alaska bridges on inventory load rating (42 t), while its 2008 build year is earlier than 30% of Ketchikan Gateway's recorded-year cohort (100 bridges).
GRAVINA ISLAND HWY in Ketchikan Gateway, Alaska is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2008, it carries 3 rated components 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 AK:2222
POST-2000 · PRESTRESS · SINGLE-SPAN · TIED-CTRL · TRACE-ADT · HEAVY-LOAD · CAT-GOOD
- POST-2000 2000+
- PRESTRESS Prestressed concrete
- SINGLE-SPAN Single span
- TIED-CTRL Tied control
- TRACE-ADT Trace ADT
- HEAVY-LOAD Heavy 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: GRAVINA ISLAND HWY
The GRAVINA ISLAND HWY bridge in Ketchikan Gateway, Alaska carries GRAVINA ISLAND HWY over GRAVINA CREEK. It was built in 2008, making it 18 years old today. The structure is built primarily of prestressed concrete and spans 1 section, stretching 19.2 meters (63 feet) end to end. Daily traffic averages 30 vehicles, placing it in the lower-traffic tier of Alaska bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure at 8/9. The weakest component sits in good condition. All reported major components score above the Poor range.
How GRAVINA ISLAND HWY compares
Age against the county: built in 2008, earlier than 30 of Ketchikan Gateway's 100 bridges with a recorded construction year (30%), against a county median build year of 1995. This is one of the newer structures in its county.
Live comparison across Alaska bridges with a recorded inventory load rating (1,679 of 1,685 rated).
GRAVINA ISLAND HWY vs every rated Alaska bridge
Inventory load rating (metric tons), FHWA NBI, this state
42 Top 28% higher than 72% of 1,679 bridges
rated Alaska 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.
Ketchikan Gateway inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 100 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
- 2008
- Material
- Prestressed Concrete
- Number of Spans
- 1
- Structure Length
- 19.2 m (63 ft)
- Deck Width
- 11.7 m (38 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 30 vehicles/day
- Structure Number
- 2222
Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • The substructure (piers and abutments) is in good condition (8/9), showing no significant deterioration.
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 GRAVINA ISLAND HWY 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 GRAVINA ISLAND HWY against other structures in Ketchikan Gateway and across Alaska. Alaska 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 GRAVINA ISLAND HWY?
GRAVINA ISLAND HWY in Ketchikan Gateway, Alaska has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is GRAVINA ISLAND HWY inspected?
GRAVINA ISLAND HWY'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 30 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. GRAVINA ISLAND HWY 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 GRAVINA ISLAND HWY?
GRAVINA ISLAND HWY has an NBI inventory load rating of 42.2 metric tons.
Who is responsible for maintaining GRAVINA ISLAND HWY?
GRAVINA ISLAND HWY is owned and maintained by State Highway Agency.
How old is GRAVINA ISLAND HWY and does age affect safety?
GRAVINA ISLAND HWY was built in 2008, making it 18 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.