US Bridges

NB SR L 35 over US 34 & 275

Fair

Mills County, Iowa · At Jct. NB SR L-35 · Structure no. 000000000600965

Built
1973
52 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
328 ft
4 main spans
Daily traffic
1,623
2022 count
Owner
State
State Highway Agency

About this bridge

NB SR L 35 over US 34 & 275 is a steel continuous stringer/multi-beam or girder carrying NB SR L 35 over US 34 & 275 in Mills County, Iowa. It was built in 1973, so it is 52 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 1,623 vehicles a day, roughly 6% of them trucks, projected to reach 1,623 by 2042. The structure is 328 ft (100 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesNB SR L 35
CrossesUS 34 & 275
LocationAt Jct. NB SR L-35
RouteCounty Highway 0
CountyMills County
StateIowa
Coordinates41.03321, -95.75318
Functional classUrban 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 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 geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.9 US tons
Inventory rating45.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length328 ft (100 m)
Longest span103 ft (31.4 m)
Deck width44 ft (13.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,623 (2022)
Projected traffic1,623 by 2042
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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 NB SR L 35 over US 34 & 275 built?

It was built in 1973, making it 52 years old in 2025.

What condition is NB SR L 35 over US 34 & 275 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 NB SR L 35 over US 34 & 275 carry?

About 1,623 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is NB SR L 35 over US 34 & 275?

The structure is 328 ft (100 m) long with a longest span of 103 ft (31.4 m) and a deck 44 ft wide.

Who owns NB SR L 35 over US 34 & 275?

It is owned by the State Highway Agency.