US Bridges

W Conger ST over Cedar River

Good

Black Hawk County, Iowa · City Bridge No. 12 · Structure no. 000000000011890

Built
1977
48 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
418 ft
4 main spans
Daily traffic
10,190
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

W Conger ST over Cedar River is a steel continuous stringer/multi-beam or girder carrying W Conger ST over Cedar River in Black Hawk County, Iowa. It was built in 1977, so it is 48 years old, older 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 10,190 vehicles a day, projected to reach 10,190 by 2043. The structure is 418 ft (127.4 m) long and 60 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesW Conger ST
CrossesCedar River
LocationCity Bridge No. 12
RouteCity Street 0
CountyBlack Hawk County
StateIowa
Coordinates42.51042, -92.36776
Functional classUrban Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating67.5 US tons
Inventory rating40.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length418 ft (127.4 m)
Longest span116 ft (35.4 m)
Deck width60 ft (18.3 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,190 (2022)
Projected traffic10,190 by 2043
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was W Conger ST over Cedar River built?

It was built in 1977, making it 48 years old in 2025.

What condition is W Conger ST over Cedar River 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 2023.

How much traffic does W Conger ST over Cedar River carry?

About 10,190 vehicles per day (2022 count).

How long is W Conger ST over Cedar River?

The structure is 418 ft (127.4 m) long with a longest span of 116 ft (35.4 m) and a deck 60 ft wide.

Who owns W Conger ST over Cedar River?

It is owned by the City or Municipal Highway Agency.