US Bridges

D Avenue over US 20

Good

Hardin County, Iowa · 2.0 Miles W of SR S27 · Structure no. 000000000606195

Built
1990
35 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
268 ft
4 main spans
Daily traffic
44
2022 count
Owner
State
State Highway Agency

About this bridge

D Avenue over US 20 is a prestressed concrete stringer/multi-beam or girder carrying D 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 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 44 vehicles a day, projected to reach 44 by 2044. The structure is 268 ft (81.7 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesD Avenue
CrossesUS 20
Location2.0 Miles W of SR S27
RouteCounty Highway 0
CountyHardin County
StateIowa
Coordinates42.44804, -93.4243
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
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 alignment6: Equal to present minimum criteria
Operating rating91.6 US tons
Inventory rating43.1 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 width33 ft (10.1 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44 (2022)
Projected traffic44 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 D Avenue over US 20 built?

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

What condition is D Avenue 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 June 2024.

How much traffic does D Avenue over US 20 carry?

About 44 vehicles per day (2022 count).

How long is D Avenue over US 20?

The structure is 268 ft (81.7 m) long with a longest span of 92 ft (28 m) and a deck 33 ft wide.

Who owns D Avenue over US 20?

It is owned by the State Highway Agency.