45-4599
Carrying 45-4599 over IRRIGATION DITCH
0.23 M N US64 & SJCR4599, San Juan, New Mexico
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
45-4599 in San Juan, New Mexico sits above 3% of rated New Mexico bridges on inventory load rating (18 t), while its 1966 build year is earlier than 71% of San Juan's recorded-year cohort (174 bridges).
45-4599 in San Juan, New Mexico is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1966, 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 NM:000000000008115
INTERSTATE-ERA · STEEL · SINGLE-SPAN · DECK-LED · LOCAL-ADT · LIGHT-LOAD · CAT-POOR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- SINGLE-SPAN Single span
- DECK-LED Deck-led
- LOCAL-ADT Local ADT
- LIGHT-LOAD Light 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: 45-4599
The 45-4599 bridge in San Juan, New Mexico carries 45-4599 over IRRIGATION DITCH. It was built in 1966, making it 60 years old today. The structure is built primarily of steel and spans 1 section, stretching 6.4 meters (21 feet) end to end. Daily traffic averages 642 vehicles, placing it in the lower-traffic tier of New Mexico bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 4/9, superstructure at 5/9, substructure at 6/9. The weakest component sits in poor condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed.
How 45-4599 compares
Age against the county: built in 1966, earlier than 124 of San Juan's 174 bridges with a recorded construction year (71%), against a county median build year of 1977. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across New Mexico bridges with a recorded inventory load rating (4,030 of 4,035 rated).
45-4599 vs every rated New Mexico bridge
Inventory load rating (metric tons), FHWA NBI, this state
18 Top 97% higher than 3% of 4,030 bridges
rated New Mexico 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.
San Juan inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 174 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
- 1966
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 6.4 m (21 ft)
- Deck Width
- 9.4 m (31 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 642 vehicles/day
- Structure Number
- 000000000008115
Condition Analysis
- • At 4/9, the deck (driving surface) is in poor shape, with advanced wear on file for this vintage.
- • The superstructure (beams and supports above the deck) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
- • The substructure (piers and abutments) rates fair at 6/9, minor deterioration that routine maintenance should address.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
45-4599 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 45-4599 against other structures in San Juan and across New Mexico. New Mexico 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 45-4599?
45-4599 in San Juan, New Mexico has a deck rating of 4/9, superstructure rating of 5/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is 45-4599 inspected?
45-4599'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 642 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 45-4599 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 45-4599?
45-4599 has an NBI inventory load rating of 17.6 metric tons.
Who is responsible for maintaining 45-4599?
45-4599 is owned and maintained by County Highway Agency.
How old is 45-4599 and does age affect safety?
45-4599 was built in 1966, making it 60 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.