COUNTY RT 21
Carrying COUNTY RT 21 over DOUBLE CREEK
04.3 MI NE JEFFERSON, Marengo, Alabama
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
COUNTY RT 21 in Marengo, Alabama sits above 6% of rated Alabama bridges on inventory load rating (12 t), while its 1935 build year is earlier than 97% of Marengo's recorded-year cohort (203 bridges).
COUNTY RT 21 in Marengo, Alabama is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1935, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 5. 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 AL:001219
PRE-1950 · STEEL · LONG-SPAN-RUN · TIED-CTRL · LOCAL-ADT · LIGHT-LOAD · CAT-FAIR
- PRE-1950 Pre-1950
- STEEL Steel
- LONG-SPAN-RUN 4 spans
- TIED-CTRL Tied control
- LOCAL-ADT Local ADT
- LIGHT-LOAD Light 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: COUNTY RT 21
The COUNTY RT 21 bridge in Marengo, Alabama carries COUNTY RT 21 over DOUBLE CREEK. It was built in 1935, making it 91 years old today. The structure is built primarily of steel and spans 4 sections, stretching 18.3 meters (60 feet) end to end. Daily traffic averages 400 vehicles, placing it in the lower-traffic tier of Alabama bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 5/9, substructure at 5/9. The weakest component sits in fair condition. All reported major components score above the Poor range.
How COUNTY RT 21 compares
Age against the county: built in 1935, earlier than 197 of Marengo's 203 bridges with a recorded construction year (97%), against a county median build year of 1988. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Alabama bridges with a recorded inventory load rating (16,191 of 16,205 rated).
COUNTY RT 21 vs every rated Alabama bridge
Inventory load rating (metric tons), FHWA NBI, this state
12 Top 94% higher than 6% of 16,191 bridges
rated Alabama 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.
Marengo inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 203 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
- 1935
- Material
- Steel
- Number of Spans
- 4
- Structure Length
- 18.3 m (60 ft)
- Deck Width
- 7.3 m (24 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 400 vehicles/day
- Structure Number
- 001219
Condition Analysis
- • The deck (driving surface) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
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 COUNTY RT 21 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 COUNTY RT 21 against other structures in Marengo and across Alabama. Alabama 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 COUNTY RT 21?
COUNTY RT 21 in Marengo, Alabama has a deck rating of 5/9, superstructure rating of 5/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is COUNTY RT 21 inspected?
COUNTY RT 21'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 400 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. COUNTY RT 21 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 COUNTY RT 21?
COUNTY RT 21 has an NBI inventory load rating of 12.2 metric tons.
Who is responsible for maintaining COUNTY RT 21?
COUNTY RT 21 is owned and maintained by County Highway Agency.
How old is COUNTY RT 21 and does age affect safety?
COUNTY RT 21 was built in 1935, making it 91 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.