US Bridges

EB US 20 over Hess RD

Fair

Black Hawk County, Iowa · 0.3 MI W of W JCT 380/218 · Structure no. 000000000605325

Built
1983
42 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
191 ft
3 main spans
Daily traffic
11,550
2022 count
Owner
State
State Highway Agency

About this bridge

EB US 20 over Hess RD is a prestressed concrete stringer/multi-beam or girder carrying EB US 20 over Hess RD in Black Hawk County, Iowa. It was built in 1983, so it is 42 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 11,550 vehicles a day, roughly 19% of them trucks, projected to reach 11,550 by 2042. The structure is 191 ft (58.2 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesEB US 20
CrossesHess RD
Location0.3 MI W of W JCT 380/218
RouteU.S. Route 20
CountyBlack Hawk County
StateIowa
Coordinates42.45304, -92.31772
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionMarch 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 rating99.8 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length191 ft (58.2 m)
Longest span92 ft (28 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,550 (2022)
Projected traffic11,550 by 2042
Trucks19%
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 EB US 20 over Hess RD built?

It was built in 1983, making it 42 years old in 2025.

What condition is EB US 20 over Hess RD 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 March 2023.

How much traffic does EB US 20 over Hess RD carry?

About 11,550 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is EB US 20 over Hess RD?

The structure is 191 ft (58.2 m) long with a longest span of 92 ft (28 m) and a deck 45 ft wide.

Who owns EB US 20 over Hess RD?

It is owned by the State Highway Agency.