US Bridges

WB US 20 over Ia 150

Fair

Buchanan County, Iowa · At Jct. 150 · Structure no. 000000000603623

Built
1978
47 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
211 ft
3 main spans
Daily traffic
3,100
2022 count
Owner
State
State Highway Agency

About this bridge

WB US 20 over Ia 150 is a prestressed concrete stringer/multi-beam or girder carrying WB US 20 over Ia 150 in Buchanan County, Iowa. It was built in 1978, so it is 47 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 3,100 vehicles a day, roughly 30% of them trucks, projected to reach 3,100 by 2042. The structure is 211 ft (64.3 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWB US 20
CrossesIa 150
LocationAt Jct. 150
RouteU.S. Route 20
CountyBuchanan County
StateIowa
Coordinates42.4488, -91.88982
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating93 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length211 ft (64.3 m)
Longest span96 ft (29.3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2022)
Projected traffic3,100 by 2042
Trucks30%
Lanes on structure2
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 WB US 20 over Ia 150 built?

It was built in 1978, making it 47 years old in 2025.

What condition is WB US 20 over Ia 150 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 May 2023.

How much traffic does WB US 20 over Ia 150 carry?

About 3,100 vehicles per day (2022 count), of which roughly 30% are trucks.

How long is WB US 20 over Ia 150?

The structure is 211 ft (64.3 m) long with a longest span of 96 ft (29.3 m) and a deck 43 ft wide.

Who owns WB US 20 over Ia 150?

It is owned by the State Highway Agency.