US Bridges

WB US 20 over CO RD S-27

Good

Hardin County, Iowa · At Junction With SR S27 · Structure no. 000000000606055

Built
1990
35 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
176 ft
3 main spans
Daily traffic
4,450
2022 count
Owner
State
State Highway Agency

About this bridge

WB US 20 over CO RD S-27 is a prestressed concrete stringer/multi-beam or girder carrying WB US 20 over CO RD S-27 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 4,450 vehicles a day, roughly 29% of them trucks, projected to reach 4,450 by 2044. The structure is 176 ft (53.6 m) long and 43 ft wide.

CarriesWB US 20
CrossesCO RD S-27
LocationAt Junction With SR S27
RouteU.S. Route 20
StateIowa
Coordinates42.44797, -93.38544
Functional classRural Principal Arterial - Other

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 inspectionJuly 2024
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 alignment8: Equal to present desirable criteria
Operating rating79.3 US tons
Inventory rating30.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span92 ft (28 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,450 (2022)
Projected traffic4,450 by 2044
Trucks29%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 CO RD S-27 built?

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

What condition is WB US 20 over CO RD S-27 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 July 2024.

How much traffic does WB US 20 over CO RD S-27 carry?

About 4,450 vehicles per day (2022 count), of which roughly 29% are trucks.

How long is WB US 20 over CO RD S-27?

The structure is 176 ft (53.6 m) long with a longest span of 92 ft (28 m) and a deck 43 ft wide.

Who owns WB US 20 over CO RD S-27?

It is owned by the State Highway Agency.