IA 78
Carrying IA 78 over STREAM
3.9 mi. E of Jct. IA 149, Keokuk, Iowa
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: IA 78
The IA 78 bridge in Keokuk, Iowa carries IA 78 over STREAM. It was built in 1937, making it 89 years old today. It was last reconstructed in 1988, extending its service life. The structure is built primarily of concrete continuous and spans 2 sections, stretching 6.4 meters (21 feet) end to end. Daily traffic averages 1,190 vehicles, placing it in the moderately-trafficked tier of Iowa bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show culvert 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. Its NBI inventory load rating is 18.2 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How IA 78 compares
Live comparison across Iowa.
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 How the historical reference is calculated.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
- 1937
- Last Reconstructed
- 1988
- Material
- Concrete Continuous
- Number of Spans
- 2
- Structure Length
- 6.4 m (21 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 1,190 vehicles/day
- Structure Number
- 000000000604370
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
IA 78 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 IA 78 against other structures in Keokuk 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 IA 78?
IA 78 in Keokuk, Iowa on the FHWA's 0–9 scale.
How often is IA 78 inspected?
IA 78'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 1,190 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. IA 78 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 IA 78?
IA 78 has an NBI inventory load rating of 18.2 metric tons.
Who is responsible for maintaining IA 78?
IA 78 is owned and maintained by State Highway Agency.
How old is IA 78 and does age affect safety?
IA 78 was built in 1937, making it 89 years old and last reconstructed in 1988.
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.