US Bridges

FM D-38 over I-380

Fair

Black Hawk County, Iowa · 2.8 Mi. S of S Jct. US 20 · Structure no. 000000000605175

Built
1984
41 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
399 ft
4 main spans
Daily traffic
854
2022 count
Owner
State
State Highway Agency

About this bridge

FM D-38 over I-380 is a steel continuous stringer/multi-beam or girder carrying FM D-38 over I-380 in Black Hawk County, Iowa. It was built in 1984, so it is 41 years old, younger 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 854 vehicles a day, roughly 3% of them trucks, projected to reach 854 by 2044. The structure is 399 ft (121.6 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFM D-38
CrossesI-380
Location2.8 Mi. S of S Jct. US 20
RouteCounty Highway 0
CountyBlack Hawk County
StateIowa
Coordinates42.41358, -92.17276
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.8 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length399 ft (121.6 m)
Longest span128 ft (39 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic854 (2022)
Projected traffic854 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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 D-38 over I-380 built?

It was built in 1984, making it 41 years old in 2025.

What condition is FM D-38 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 October 2024.

How much traffic does FM D-38 over I-380 carry?

About 854 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is FM D-38 over I-380?

The structure is 399 ft (121.6 m) long with a longest span of 128 ft (39 m) and a deck 43 ft wide.

Who owns FM D-38 over I-380?

It is owned by the State Highway Agency.