US Bridges

I-8 WB over 4th ST (giss Parkway)

Fair

Yuma County, Arizona · 1.7 MI N JCT US 95 · Structure no. 01323

Built
1969
56 years old
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
204 ft
2 main spans
Daily traffic
15,040
2021 count
Owner
State
State Highway Agency

About this bridge

I-8 WB over 4th ST (giss Parkway) is a concrete continuous box beam or girders - single or spread carrying I-8 WB over 4th ST (giss Parkway) in Yuma County, Arizona. It was built in 1969, so it is 56 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 15,040 vehicles a day, roughly 15% of them trucks, projected to reach 15,050 by 2041. The structure is 204 ft (62.2 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-8 WB
Crosses4th ST (giss Parkway)
Location1.7 MI N JCT US 95
RouteInterstate 8
CountyYuma County
StateArizona
Coordinates32.7222, -114.6133
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating50 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length204 ft (62.2 m)
Longest span102 ft (31.1 m)
Deck width50 ft (15.1 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,040 (2021)
Projected traffic15,050 by 2041
Trucks15%
Lanes on structure3
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 4th ST (giss Parkway) built?

It was built in 1969, making it 56 years old in 2025.

What condition is I-8 WB over 4th ST (giss Parkway) 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 January 2025.

How much traffic does I-8 WB over 4th ST (giss Parkway) carry?

About 15,040 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is I-8 WB over 4th ST (giss Parkway)?

The structure is 204 ft (62.2 m) long with a longest span of 102 ft (31.1 m) and a deck 50 ft wide.

Who owns I-8 WB over 4th ST (giss Parkway)?

It is owned by the State Highway Agency.