US Bridges

US 151 over Iowa River

Fair

Iowa County, Iowa · 1.0 Mi. N of N Jct. US 6 · Structure no. 000000000029541

Built
1974
51 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
444 ft
5 main spans
Daily traffic
5,500
2022 count
Owner
State
State Highway Agency

About this bridge

US 151 over Iowa River is a prestressed concrete stringer/multi-beam or girder carrying US 151 over Iowa River in Iowa County, Iowa. It was built in 1974, so it is 51 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 5,500 vehicles a day, roughly 12% of them trucks, projected to reach 5,500 by 2043. The structure is 444 ft (135.3 m) long and 47 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesUS 151
CrossesIowa River
Location1.0 Mi. N of N Jct. US 6
RouteU.S. Route 151
CountyIowa County
StateIowa
Coordinates41.77641, -91.86386
Functional classRural Principal Arterial - Other

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.7 US tons
Inventory rating34.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length444 ft (135.3 m)
Longest span97 ft (29.6 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,500 (2022)
Projected traffic5,500 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 151 over Iowa River built?

It was built in 1974, making it 51 years old in 2025.

What condition is US 151 over Iowa River 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 June 2023.

How much traffic does US 151 over Iowa River carry?

About 5,500 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is US 151 over Iowa River?

The structure is 444 ft (135.3 m) long with a longest span of 97 ft (29.6 m) and a deck 47 ft wide.

Who owns US 151 over Iowa River?

It is owned by the State Highway Agency.