E16
Carrying E16 over MARROWBONE CREEK
085331701, Carroll, Iowa
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
E16 in Carroll, Iowa sits above 49% of rated Iowa bridges on inventory load rating (31 t), while its 1949 build year is earlier than 89% of Carroll's recorded-year cohort (249 bridges).
E16 in Carroll, Iowa is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1949, 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 IA:000000000017370
PRE-1950 · STEEL · MULTI-SPAN · TIED-CTRL · LOCAL-ADT · STANDARD-LOAD · CAT-FAIR
- PRE-1950 Pre-1950
- STEEL Steel
- MULTI-SPAN 3 spans
- TIED-CTRL Tied control
- LOCAL-ADT Local ADT
- STANDARD-LOAD Standard 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: E16
The E16 bridge in Carroll, Iowa carries E16 over MARROWBONE CREEK. It was built in 1949, making it 77 years old today. The structure is built primarily of steel continuous and spans 3 sections, stretching 37.8 meters (124 feet) end to end. Daily traffic averages 558 vehicles, placing it in the lower-traffic tier of Iowa 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 E16 compares
Age against the county: built in 1949, earlier than 221 of Carroll's 249 bridges with a recorded construction year (89%), against a county median build year of 1981. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Iowa bridges with a recorded inventory load rating (23,718 of 23,719 rated).
E16 vs every rated Iowa bridge
Inventory load rating (metric tons), FHWA NBI, this state
31 Top 51% higher than 49% of 23,718 bridges
rated Iowa 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.
Carroll inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 249 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
- 1949
- Material
- Steel Continuous
- Number of Spans
- 3
- Structure Length
- 37.8 m (124 ft)
- Deck Width
- 9.8 m (32 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 558 vehicles/day
- Structure Number
- 000000000017370
Condition Analysis
- • The deck (driving surface) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • The superstructure (beams and supports above the deck) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • 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 E16 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 E16 against other structures in Carroll and across Iowa. Iowa 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 E16?
E16 in Carroll, Iowa 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 E16 inspected?
E16'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 558 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. E16 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 E16?
E16 has an NBI inventory load rating of 31.1 metric tons.
Who is responsible for maintaining E16?
E16 is owned and maintained by County Highway Agency.
How old is E16 and does age affect safety?
E16 was built in 1949, making it 77 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.