US Bridges

H Avenue over US 20

Fair

Hardin County, Iowa · 2.0 Miles E of JCT SR S27 · Structure no. 000000000606220

Built
1990
35 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
263 ft
4 main spans
Daily traffic
59
2022 count
Owner
State
State Highway Agency

About this bridge

H Avenue over US 20 is a prestressed concrete stringer/multi-beam or girder carrying H Avenue over US 20 in Hardin County, Iowa. It was built in 1990, so it is 35 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 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 59 vehicles a day, projected to reach 59 by 2042. The structure is 263 ft (80.2 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesH Avenue
CrossesUS 20
Location2.0 Miles E of JCT SR S27
RouteCounty Highway 0
CountyHardin County
StateIowa
Coordinates42.44816, -93.34661
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating90.3 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length263 ft (80.2 m)
Longest span92 ft (28 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic59 (2022)
Projected traffic59 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 H Avenue over US 20 built?

It was built in 1990, making it 35 years old in 2025.

What condition is H Avenue over US 20 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 April 2023.

How much traffic does H Avenue over US 20 carry?

About 59 vehicles per day (2022 count).

How long is H Avenue over US 20?

The structure is 263 ft (80.2 m) long with a longest span of 92 ft (28 m) and a deck 33 ft wide.

Who owns H Avenue over US 20?

It is owned by the State Highway Agency.