DALTON HIGHWAY
Carrying DALTON HIGHWAY over HAMMOND RIVER
MILE POINT 190.0, Yukon-Koyukuk, Alaska
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
DALTON HIGHWAY in Yukon-Koyukuk, Alaska sits above 91% of rated Alaska bridges on inventory load rating (66 t), while its 1972 build year is earlier than 41% of Yukon-Koyukuk's recorded-year cohort (94 bridges).
DALTON HIGHWAY in Yukon-Koyukuk, Alaska is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1972, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor 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:1336
INTERSTATE-ERA · STEEL · SINGLE-SPAN · SUB-LED · LOCAL-ADT · HEAVY-LOAD · CAT-POOR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- SINGLE-SPAN Single span
- SUB-LED Substructure-led
- LOCAL-ADT Local ADT
- HEAVY-LOAD Heavy load
- CAT-POOR Poor
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: DALTON HIGHWAY
The DALTON HIGHWAY bridge in Yukon-Koyukuk, Alaska carries DALTON HIGHWAY over HAMMOND RIVER. It was built in 1972, making it 54 years old today. It was last reconstructed in 1992, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 46.3 meters (152 feet) end to end. Daily traffic averages 110 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 6/9, superstructure at 6/9, substructure at 4/9. The weakest component sits in poor condition. Because at least one major component scores 4 or lower, this bridge falls in FHWA's Poor condition category. That category is not a closure order.
How DALTON HIGHWAY compares
Age against the county: built in 1972, earlier than 39 of Yukon-Koyukuk's 94 bridges with a recorded construction year (41%), against a county median build year of 1972.
Live comparison across Alaska bridges with a recorded inventory load rating (1,679 of 1,685 rated).
DALTON HIGHWAY vs every rated Alaska bridge
Inventory load rating (metric tons), FHWA NBI, this state
66 Top 9% higher than 91% 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.
Yukon-Koyukuk inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 94 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
- 1972
- Last Reconstructed
- 1992
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 46.3 m (152 ft)
- Deck Width
- 8.4 m (28 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 110 vehicles/day
- Structure Number
- 1336
Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • At 4/9, the substructure (piers and abutments) is in poor shape, with advanced wear on file for this vintage.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
DALTON HIGHWAY 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 DALTON HIGHWAY against other structures in Yukon-Koyukuk 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 DALTON HIGHWAY?
DALTON HIGHWAY in Yukon-Koyukuk, Alaska has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is DALTON HIGHWAY inspected?
DALTON HIGHWAY'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 110 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. DALTON HIGHWAY 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 DALTON HIGHWAY?
DALTON HIGHWAY has an NBI inventory load rating of 65.5 metric tons.
Who is responsible for maintaining DALTON HIGHWAY?
DALTON HIGHWAY is owned and maintained by State Highway Agency.
How old is DALTON HIGHWAY and does age affect safety?
DALTON HIGHWAY was built in 1972, making it 54 years old and last reconstructed in 1992.
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.