US Bridges

I-8 WB over Sentinel RD

Fair

Maricopa County, Arizona · 28.6 MI W JCT SR 85 · Structure no. 00688

Built
1962
63 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete Continuous
Length
97 ft
3 main spans
Daily traffic
6,417
2022 count
Owner
State
State Highway Agency

About this bridge

I-8 WB over Sentinel RD is a concrete continuous slab carrying I-8 WB over Sentinel RD in Maricopa County, Arizona. It was built in 1962, so it is 63 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 6,417 vehicles a day, roughly 26% of them trucks, projected to reach 6,427 by 2042. The structure is 97 ft (29.6 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-8 WB
CrossesSentinel RD
Location28.6 MI W JCT SR 85
RouteInterstate 8
CountyMaricopa County
StateArizona
Coordinates32.8586, -113.2132
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating41 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length97 ft (29.6 m)
Longest span36 ft (11 m)
Deck width43 ft (13.1 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,417 (2022)
Projected traffic6,427 by 2042
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-8 WB over Sentinel RD built?

It was built in 1962, making it 63 years old in 2025.

What condition is I-8 WB over Sentinel RD in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2023.

How much traffic does I-8 WB over Sentinel RD carry?

About 6,417 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is I-8 WB over Sentinel RD?

The structure is 97 ft (29.6 m) long with a longest span of 36 ft (11 m) and a deck 43 ft wide.

Who owns I-8 WB over Sentinel RD?

It is owned by the State Highway Agency.