156TH ST NB
Carrying 156TH ST NB over WALNUT CREEK
200 ft North of Brookview, Dallas, Iowa
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: 156TH ST NB
The 156TH ST NB bridge in Dallas, Iowa carries 156TH ST NB over WALNUT CREEK. It was built in 2015, making it 11 years old today. The structure is built primarily of concrete continuous and spans 3 sections, stretching 52.1 meters (171 feet) end to end. Daily traffic averages 222 vehicles, placing it in the lower-traffic tier of Iowa bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 8/9, superstructure at 8/9, substructure at 8/9. The weakest component sits in good condition. All reported major components score above the Poor range. Its NBI inventory load rating is 32.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How 156TH ST NB 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 How the historical reference is calculated.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
- 2015
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 52.1 m (171 ft)
- Deck Width
- 11.9 m (39 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 222 vehicles/day
- Structure Number
- 000000000505340
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in good condition (8/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) rates good at 8/9, with no significant deterioration on file.
- • The substructure (piers and abutments) rates good at 8/9, with no significant deterioration on file.
How to read this record
This page shows what the last federal inspection recorded, not whether 156TH ST NB 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 156TH ST NB against other structures in Dallas 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 156TH ST NB?
156TH ST NB in Dallas, Iowa has a deck rating of 8/9, superstructure rating of 8/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is 156TH ST NB inspected?
156TH ST NB'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 222 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 156TH ST NB is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for 156TH ST NB?
156TH ST NB has an NBI inventory load rating of 32.4 metric tons.
Who is responsible for maintaining 156TH ST NB?
156TH ST NB is owned and maintained by City/Municipal Highway Agency.
How old is 156TH ST NB and does age affect safety?
156TH ST NB was built in 2015, making it 11 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.
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.