US Bridges

NB I-35 over Over Imrl RR

Fair

Cerro Gordo County, Iowa · 0.2 Mi. S of Jct. 18 · Structure no. 000000000019200

Built
1970
55 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
179 ft
3 main spans
Daily traffic
11,100
2023 count
Owner
State
State Highway Agency

About this bridge

NB I-35 over Over Imrl RR is a prestressed concrete stringer/multi-beam or girder carrying NB I-35 over Over Imrl RR in Cerro Gordo County, Iowa. It was built in 1970, so it is 55 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 6 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 11,100 vehicles a day, roughly 32% of them trucks, projected to reach 11,100 by 2043. The structure is 179 ft (54.6 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB I-35
CrossesOver Imrl RR
Location0.2 Mi. S of Jct. 18
RouteInterstate 35
CountyCerro Gordo County
StateIowa
Coordinates43.14102, -93.35573
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating68 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length179 ft (54.6 m)
Longest span69 ft (21 m)
Deck width55 ft (16.9 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,100 (2023)
Projected traffic11,100 by 2043
Trucks32%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
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 NB I-35 over Over Imrl RR built?

It was built in 1970, making it 55 years old in 2025.

What condition is NB I-35 over Over Imrl RR 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 NB I-35 over Over Imrl RR carry?

About 11,100 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is NB I-35 over Over Imrl RR?

The structure is 179 ft (54.6 m) long with a longest span of 69 ft (21 m) and a deck 55 ft wide.

Who owns NB I-35 over Over Imrl RR?

It is owned by the State Highway Agency.