US Bridges

Ia 150 over Cedar River Overflow

Fair

Benton County, Iowa · 0.1 Mi. S of Jct. SR E16 · Structure no. 000000000014471

Built
1940
85 years old, rebuilt 1987
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
643 ft
3 main spans
Daily traffic
3,810
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 150 over Cedar River Overflow is a steel continuous stringer/multi-beam or girder carrying Ia 150 over Cedar River Overflow in Benton County, Iowa. It was built in 1940 and reconstructed in 1987, so it is 85 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 3,810 vehicles a day, roughly 5% of them trucks, projected to reach 3,810 by 2043. The structure is 643 ft (196 m) long and 33 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesIa 150
CrossesCedar River Overflow
Location0.1 Mi. S of Jct. SR E16
RouteState Highway 150
CountyBenton County
StateIowa
Coordinates42.18184, -92.0204
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating51.7 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+4 approach)
Design loadHS 20
Structure length643 ft (196 m)
Longest span122 ft (37.2 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,810 (2022)
Projected traffic3,810 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Ia 150 over Cedar River Overflow built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1987.

What condition is Ia 150 over Cedar River Overflow 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 July 2023.

How much traffic does Ia 150 over Cedar River Overflow carry?

About 3,810 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Ia 150 over Cedar River Overflow?

The structure is 643 ft (196 m) long with a longest span of 122 ft (37.2 m) and a deck 33 ft wide.

Who owns Ia 150 over Cedar River Overflow?

It is owned by the State Highway Agency.