US Bridges

Iowa Ave (mhi) over US 20

Good

Buchanan County, Iowa · 1.5 Mi. W of Jct. Ia 150 · Structure no. 000000000604925

Built
1980
45 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
268 ft
4 main spans
Daily traffic
1,218
2022 count
Owner
State
State Highway Agency

About this bridge

Iowa Ave (mhi) over US 20 is a prestressed concrete stringer/multi-beam or girder carrying Iowa Ave (mhi) over US 20 in Buchanan County, Iowa. It was built in 1980, so it is 45 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,218 vehicles a day, roughly 6% of them trucks, projected to reach 1,218 by 2043. The structure is 268 ft (81.7 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesIowa Ave (mhi)
CrossesUS 20
Location1.5 Mi. W of Jct. Ia 150
RouteCounty Highway 0
CountyBuchanan County
StateIowa
Coordinates42.44774, -91.91953
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99.8 US tons
Inventory rating45.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length268 ft (81.7 m)
Longest span92 ft (28 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,218 (2022)
Projected traffic1,218 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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 Iowa Ave (mhi) over US 20 built?

It was built in 1980, making it 45 years old in 2025.

What condition is Iowa Ave (mhi) over US 20 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Iowa Ave (mhi) over US 20 carry?

About 1,218 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Iowa Ave (mhi) over US 20?

The structure is 268 ft (81.7 m) long with a longest span of 92 ft (28 m) and a deck 47 ft wide.

Who owns Iowa Ave (mhi) over US 20?

It is owned by the State Highway Agency.