8400000
Carrying 8400000 over TRAIL # 828400SHOAL
SHOAL COVE, Ketchikan Gateway, Alaska
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: 8400000
The 8400000 bridge in Ketchikan Gateway, Alaska carries 8400000 over TRAIL # 828400SHOAL. It was built in 1992, making it 34 years old today. The structure is built primarily of steel and spans 1 section, stretching 18.3 meters (60 feet) end to end. Daily traffic averages 5 vehicles, placing it in the lower-traffic tier of Alaska bridges. It is owned and maintained by U.S. Forest Service.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 4/9, substructure at 6/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules. Its NBI inventory load rating is 19.8 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How 8400000 compares
Live comparison across Alaska.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1992
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 18.3 m (60 ft)
- Deck Width
- 5.5 m (18 ft)
- Owner
- U.S. Forest Service
- Avg Daily Traffic
- 5 vehicles/day
- Structure Number
- 100520000032846
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗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 poor at 4/9, advanced deterioration that should be prioritized for repair.
- • The substructure (piers and abutments) rates fair at 6/9, minor deterioration that routine maintenance should address.
How to read this record
8400000 is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare 8400000 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 8400000?
8400000 in Ketchikan Gateway, Alaska has a deck rating of 7/9, superstructure rating of 4/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is 8400000 inspected?
8400000'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 5 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 8400000 is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for 8400000?
8400000 has an NBI inventory load rating of 19.8 metric tons.
Who is responsible for maintaining 8400000?
8400000 is owned and maintained by U.S. Forest Service.
How old is 8400000 and does age affect safety?
8400000 was built in 1992, making it 34 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.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.