US Bridges

I 35 NB over Ia 175

Fair

Hamilton County, Iowa · At Junction With Ia 175 · Structure no. 000000000026690

Built
1966
59 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
252 ft
4 main spans
Daily traffic
11,850
2023 count
Owner
State
State Highway Agency

About this bridge

I 35 NB over Ia 175 is a prestressed concrete stringer/multi-beam or girder carrying I 35 NB over Ia 175 in Hamilton County, Iowa. It was built in 1966, so it is 59 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 11,850 vehicles a day, roughly 26% of them trucks, projected to reach 11,850 by 2043. The structure is 252 ft (76.8 m) long and 45 ft wide.

Location

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CarriesI 35 NB
CrossesIa 175
LocationAt Junction With Ia 175
RouteInterstate 35
CountyHamilton County
StateIowa
Coordinates42.31021, -93.56925
Functional classRural Principal Arterial - Interstate

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating80.1 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length252 ft (76.8 m)
Longest span69 ft (21 m)
Deck width45 ft (13.7 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,850 (2023)
Projected traffic11,850 by 2043
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 35 NB over Ia 175 built?

It was built in 1966, making it 59 years old in 2025.

What condition is I 35 NB over Ia 175 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 February 2024.

How much traffic does I 35 NB over Ia 175 carry?

About 11,850 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is I 35 NB over Ia 175?

The structure is 252 ft (76.8 m) long with a longest span of 69 ft (21 m) and a deck 45 ft wide.

Who owns I 35 NB over Ia 175?

It is owned by the State Highway Agency.