US Bridges

NB Ia 27 over Ia 57

Fair

Black Hawk County, Iowa · At Jct. Ia 57 & US 218 · Structure no. 000000000601245

Built
1994
31 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
308 ft
4 main spans
Daily traffic
6,600
2022 count
Owner
State
State Highway Agency

About this bridge

NB Ia 27 over Ia 57 is a prestressed concrete stringer/multi-beam or girder carrying NB Ia 27 over Ia 57 in Black Hawk County, Iowa. It was built in 1994, so it is 31 years old, younger 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 6,600 vehicles a day, roughly 7% of them trucks, projected to reach 6,600 by 2042. The structure is 308 ft (93.9 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB Ia 27
CrossesIa 57
LocationAt Jct. Ia 57 & US 218
RouteState Highway 27
CountyBlack Hawk County
StateIowa
Coordinates42.53708, -92.42595
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 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 geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.2 US tons
Inventory rating26.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length308 ft (93.9 m)
Longest span101 ft (30.8 m)
Deck width58 ft (17.6 m)
Roadway width54 ft (16.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,600 (2022)
Projected traffic6,600 by 2042
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Ia 27 over Ia 57 built?

It was built in 1994, making it 31 years old in 2025.

What condition is NB Ia 27 over Ia 57 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 2023.

How much traffic does NB Ia 27 over Ia 57 carry?

About 6,600 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is NB Ia 27 over Ia 57?

The structure is 308 ft (93.9 m) long with a longest span of 101 ft (30.8 m) and a deck 58 ft wide.

Who owns NB Ia 27 over Ia 57?

It is owned by the State Highway Agency.