US Bridges

SR RD L-40 over I-29

Fair

Fremont County, Iowa · 4.1 Mi. N of Ia 333 · Structure no. 000000000600060

Built
1972
53 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
290 ft
4 main spans
Daily traffic
40
2022 count
Owner
State
State Highway Agency

About this bridge

SR RD L-40 over I-29 is a prestressed concrete stringer/multi-beam or girder carrying SR RD L-40 over I-29 in Fremont County, Iowa. It was built in 1972, so it is 53 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 40 vehicles a day, roughly 43% of them trucks, projected to reach 40 by 2044. The structure is 290 ft (88.4 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesSR RD L-40
CrossesI-29
Location4.1 Mi. N of Ia 333
RouteCounty Highway 0
CountyFremont County
StateIowa
Coordinates40.63934, -95.73642
Functional classRural Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
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 geometry7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating77.6 US tons
Inventory rating23.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length290 ft (88.4 m)
Longest span97 ft (29.6 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2022)
Projected traffic40 by 2044
Trucks43%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 RD L-40 over I-29 built?

It was built in 1972, making it 53 years old in 2025.

What condition is SR RD L-40 over I-29 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 2024.

How much traffic does SR RD L-40 over I-29 carry?

About 40 vehicles per day (2022 count), of which roughly 43% are trucks.

How long is SR RD L-40 over I-29?

The structure is 290 ft (88.4 m) long with a longest span of 97 ft (29.6 m) and a deck 33 ft wide.

Who owns SR RD L-40 over I-29?

It is owned by the State Highway Agency.