US Bridges

FM F-28 over I-380

Fair

Johnson County, Iowa · At Jct. SR F28 · Structure no. 000000000205005

Built
1970
55 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
258 ft
4 main spans
Daily traffic
8,900
2022 count
Owner
State
State Highway Agency

About this bridge

FM F-28 over I-380 is a prestressed concrete stringer/multi-beam or girder carrying FM F-28 over I-380 in Johnson County, Iowa. It was built in 1970, so it is 55 years old, older than the Iowa average of 45.5 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 8,900 vehicles a day, roughly 7% of them trucks, projected to reach 8,900 by 2043. The structure is 258 ft (78.6 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFM F-28
CrossesI-380
LocationAt Jct. SR F28
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.75245, -91.64268
Functional classUrban Minor Arterial

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 inspectionAugust 2023
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 alignment6: Equal to present minimum criteria
Operating rating88.6 US tons
Inventory rating36.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length258 ft (78.6 m)
Longest span86 ft (26.2 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,900 (2022)
Projected traffic8,900 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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 FM F-28 over I-380 built?

It was built in 1970, making it 55 years old in 2025.

What condition is FM F-28 over I-380 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 August 2023.

How much traffic does FM F-28 over I-380 carry?

About 8,900 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is FM F-28 over I-380?

The structure is 258 ft (78.6 m) long with a longest span of 86 ft (26.2 m) and a deck 35 ft wide.

Who owns FM F-28 over I-380?

It is owned by the State Highway Agency.