US Bridges

W.4th ST over Drainage

Fair

Black Hawk County, Iowa · City Culvert No. 35C · Structure no. 000000000503301

Built
1986
39 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
5,322
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

W.4th ST over Drainage is a concrete culvert carrying W.4th ST over Drainage in Black Hawk County, Iowa. It was built in 1986, so it is 39 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 5,322 vehicles a day, projected to reach 5,322 by 2043. The structure is 23 ft (7 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesW.4th ST
CrossesDrainage
LocationCity Culvert No. 35C
RouteCity Street 0
CountyBlack Hawk County
StateIowa
Coordinates42.46371, -92.39178
Functional classUrban Minor 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.3 US tons
Inventory rating41.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width60 ft (18.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,322 (2022)
Projected traffic5,322 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Drainage built?

It was built in 1986, making it 39 years old in 2025.

What condition is W.4th ST over Drainage 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 Drainage carry?

About 5,322 vehicles per day (2022 count).

How long is W.4th ST over Drainage?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m) and a deck 60 ft wide.

Who owns W.4th ST over Drainage?

It is owned by the City or Municipal Highway Agency.