280TH ST
Carrying 280TH ST over BOONE RIVER
088253108, Hamilton, Iowa
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: 280TH ST
The 280TH ST bridge in Hamilton, Iowa carries 280TH ST over BOONE RIVER. It was built in 1902, making it 124 years old today. It was last reconstructed in 2008, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 56.7 meters (186 feet) end to end. Daily traffic averages 62 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 0/9, superstructure at 0/9, substructure at 0/9. The weakest component sits in critical condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How 280TH ST 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 How the historical reference is calculated.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
- 1902
- Last Reconstructed
- 2008
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 56.7 m (186 ft)
- Deck Width
- 4.9 m (16 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 62 vehicles/day
- Structure Number
- 000000000171920
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates critical at 0/9, severe deterioration that needs urgent attention.
- • The superstructure (beams and supports above the deck) is in critical condition (0/9), with severe deterioration requiring urgent attention.
- • The substructure (piers and abutments) is in critical condition (0/9), with severe deterioration requiring urgent attention.
How to read this record
280TH ST 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 280TH ST against other structures in Hamilton 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 280TH ST?
280TH ST in Hamilton, Iowa has a deck rating of 0/9, superstructure rating of 0/9, and substructure rating of 0/9 on the FHWA's 0–9 scale.
How often is 280TH ST inspected?
280TH ST'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 62 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 280TH ST 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 280TH ST?
An inventory load rating is not recorded for 280TH ST.
Who is responsible for maintaining 280TH ST?
280TH ST is owned and maintained by County Highway Agency.
How old is 280TH ST and does age affect safety?
280TH ST was built in 1902, making it 124 years old and last reconstructed in 2008.
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.