US Bridges

SR L-55 over I 80

Fair

Pottawattamie County, Iowa · At Jct. SR L55 · Structure no. 000000000045360

Built
1969
56 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
275 ft
4 main spans
Daily traffic
2,011
2022 count
Owner
State
State Highway Agency

About this bridge

SR L-55 over I 80 is a steel continuous stringer/multi-beam or girder carrying SR L-55 over I 80 in Pottawattamie County, Iowa. It was built in 1969, so it is 56 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 5 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 2,011 vehicles a day, roughly 11% of them trucks, projected to reach 2,011 by 2043. The structure is 275 ft (83.8 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSR L-55
CrossesI 80
LocationAt Jct. SR L55
RouteCounty Highway 0
CountyPottawattamie County
StateIowa
Coordinates41.44029, -95.6121
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.9 US tons
Inventory rating25.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length275 ft (83.8 m)
Longest span76 ft (23.2 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,011 (2022)
Projected traffic2,011 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed8.1 mi (13 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 SR L-55 over I 80 built?

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

What condition is SR L-55 over I 80 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 SR L-55 over I 80 carry?

About 2,011 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is SR L-55 over I 80?

The structure is 275 ft (83.8 m) long with a longest span of 76 ft (23.2 m) and a deck 31 ft wide.

Who owns SR L-55 over I 80?

It is owned by the State Highway Agency.