US Bridges

W 4th ST over Cedar River

Fair

Black Hawk County, Iowa · City Bridge No. 34 · Structure no. 000000000501690

Built
1975
50 years old
Condition
Fair
inspected June 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
577 ft
5 main spans
Daily traffic
1,908
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

W 4th ST over Cedar River is a steel continuous girder and floorbeam system carrying W 4th ST over Cedar River in Black Hawk County, Iowa. It was built in 1975, so it is 50 years old, older 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 1,908 vehicles a day, projected to reach 1,908 by 2043. The structure is 577 ft (175.9 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesW 4th ST
CrossesCedar River
LocationCity Bridge No. 34
RouteCity Street 0
CountyBlack Hawk County
StateIowa
Coordinates42.49623, -92.33871
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.2 US tons
Inventory rating48.2 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length577 ft (175.9 m)
Longest span130 ft (39.6 m)
Deck width54 ft (16.5 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,908 (2022)
Projected traffic1,908 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was W 4th ST over Cedar River built?

It was built in 1975, making it 50 years old in 2025.

What condition is W 4th ST over Cedar River 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 June 2023.

How much traffic does W 4th ST over Cedar River carry?

About 1,908 vehicles per day (2022 count).

How long is W 4th ST over Cedar River?

The structure is 577 ft (175.9 m) long with a longest span of 130 ft (39.6 m) and a deck 54 ft wide.

Who owns W 4th ST over Cedar River?

It is owned by the City or Municipal Highway Agency.