US Bridges

FM L-66 over I-80

Fair

Pottawattamie County, Iowa · At Jct. SR L66 · Structure no. 000000000045420

Built
1965
60 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
227 ft
4 main spans
Daily traffic
837
2022 count
Owner
State
State Highway Agency

About this bridge

FM L-66 over I-80 is a prestressed concrete stringer/multi-beam or girder carrying FM L-66 over I-80 in Pottawattamie County, Iowa. It was built in 1965, so it is 60 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 837 vehicles a day, roughly 14% of them trucks, projected to reach 837 by 2042. The structure is 227 ft (69.2 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM L-66
CrossesI-80
LocationAt Jct. SR L66
RouteCounty Highway 0
CountyPottawattamie County
StateIowa
Coordinates41.49771, -95.54619
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating63.7 US tons
Inventory rating21.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length227 ft (69.2 m)
Longest span69 ft (21 m)
Deck width32 ft (9.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic837 (2022)
Projected traffic837 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 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 L-66 over I-80 built?

It was built in 1965, making it 60 years old in 2025.

What condition is FM L-66 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 April 2023.

How much traffic does FM L-66 over I-80 carry?

About 837 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is FM L-66 over I-80?

The structure is 227 ft (69.2 m) long with a longest span of 69 ft (21 m) and a deck 32 ft wide.

Who owns FM L-66 over I-80?

It is owned by the State Highway Agency.