221ST STREET
Carrying 221ST STREET over OVER BNSF RR
072433304, Mills, Iowa
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
221ST STREET in Mills, Iowa sits above 71% of rated Iowa bridges on inventory load rating (35 t), while its 2008 build year is earlier than 14% of Mills's recorded-year cohort (184 bridges).
221ST STREET in Mills, Iowa is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2008, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 7. The lowest applicable rating sets the federal condition category, so this Good 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:000000000035781
POST-2000 · PRESTRESS · MULTI-SPAN · DECK-LED · LOCAL-ADT · STANDARD-LOAD · CAT-GOOD
- POST-2000 2000+
- PRESTRESS Prestressed concrete
- MULTI-SPAN 3 spans
- DECK-LED Deck-led
- LOCAL-ADT Local ADT
- STANDARD-LOAD Standard load
- CAT-GOOD Good
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: 221ST STREET
The 221ST STREET bridge in Mills, Iowa carries 221ST STREET over OVER BNSF RR. It was built in 2008, making it 18 years old today. The structure is built primarily of prestressed concrete and spans 3 sections, stretching 53.3 meters (175 feet) end to end. Daily traffic averages 847 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 7/9, superstructure at 8/9, substructure at 8/9. The weakest component sits in good condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How 221ST STREET compares
Age against the county: built in 2008, earlier than 26 of Mills's 184 bridges with a recorded construction year (14%), against a county median build year of 1971. This is one of the newer structures in its county.
Live comparison across Iowa bridges with a recorded inventory load rating (23,718 of 23,719 rated).
221ST STREET vs every rated Iowa bridge
Inventory load rating (metric tons), FHWA NBI, this state
35 Top 29% higher than 71% 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.
Mills inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 184 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
- 2008
- Material
- Prestressed Concrete
- Number of Spans
- 3
- Structure Length
- 53.3 m (175 ft)
- Deck Width
- 10.1 m (33 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 847 vehicles/day
- Structure Number
- 000000000035781
Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) rates good at 8/9, with no significant deterioration on file.
- • At 8/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
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 221ST STREET 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 221ST STREET against other structures in Mills 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 221ST STREET?
221ST STREET in Mills, Iowa has a deck rating of 7/9, superstructure rating of 8/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is 221ST STREET inspected?
221ST STREET'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 847 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 221ST STREET 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 221ST STREET?
221ST STREET has an NBI inventory load rating of 34.7 metric tons.
Who is responsible for maintaining 221ST STREET?
221ST STREET is owned and maintained by County Highway Agency.
How old is 221ST STREET and does age affect safety?
221ST STREET was built in 2008, making it 18 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.