Union Hills Drive
Carrying Union Hills Drive over SR 51
6 mi E I-17 & 1 mi S L101, Maricopa, Arizona
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
Union Hills Drive in Maricopa, Arizona sits above 71% of rated Arizona bridges on inventory load rating (51 t), while its 2003 build year is earlier than 25% of Maricopa's recorded-year cohort (2,847 bridges).
Union Hills Drive in Maricopa, Arizona is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2003, 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 AZ:01454
POST-2000 · PRESTRESS · MULTI-SPAN · TIED-CTRL · HEAVY-ADT · HEAVY-LOAD · CAT-GOOD
- POST-2000 2000+
- PRESTRESS Prestressed concrete
- MULTI-SPAN 2 spans
- TIED-CTRL Tied control
- HEAVY-ADT Heavy ADT
- HEAVY-LOAD Heavy 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: Union Hills Drive
The Union Hills Drive bridge in Maricopa, Arizona carries Union Hills Drive over SR 51. It was built in 2003, making it 23 years old today. The structure is built primarily of prestressed concrete continuous and spans 2 sections, stretching 57.6 meters (189 feet) end to end. Daily traffic averages 23,872 vehicles, placing it in the heavily-trafficked tier of Arizona bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in good condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How Union Hills Drive compares
Age against the county: built in 2003, earlier than 725 of Maricopa's 2,847 bridges with a recorded construction year (25%), against a county median build year of 1991. This is one of the newer structures in its county.
Live comparison across Arizona bridges with a recorded inventory load rating (8,572 of 8,573 rated).
Union Hills Drive vs every rated Arizona bridge
Inventory load rating (metric tons), FHWA NBI, this state
51 Top 29% higher than 71% of 8,572 bridges
rated Arizona 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.
Maricopa inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 2,847 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
- 2003
- Material
- Prestressed Concrete Continuous
- Number of Spans
- 2
- Structure Length
- 57.6 m (189 ft)
- Deck Width
- 48.7 m (160 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 23,872 vehicles/day
- Structure Number
- 01454
Condition Analysis
- • The deck (driving surface) rates good at 7/9, with no significant deterioration on file.
- • The superstructure (beams and supports above the deck) is in good condition (7/9), showing no significant deterioration.
- • At 7/9, 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 Union Hills Drive 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 Union Hills Drive against other structures in Maricopa and across Arizona. Arizona 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 Union Hills Drive?
Union Hills Drive in Maricopa, Arizona has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is Union Hills Drive inspected?
Union Hills Drive'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 23,872 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. Union Hills Drive 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 Union Hills Drive?
Union Hills Drive has an NBI inventory load rating of 50.8 metric tons.
Who is responsible for maintaining Union Hills Drive?
Union Hills Drive is owned and maintained by State Highway Agency.
How old is Union Hills Drive and does age affect safety?
Union Hills Drive was built in 2003, making it 23 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.