US Bridges

River RD over Black Hawk Creek

Fair

Black Hawk County, Iowa · City Bridge No. 29 · Structure no. 000000000501640

Built
1971
54 years old, rebuilt 2003
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
364 ft
5 main spans
Daily traffic
6,513
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

River RD over Black Hawk Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying River RD over Black Hawk Creek in Black Hawk County, Iowa. It was built in 1971 and reconstructed in 2003, so it is 54 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 6,513 vehicles a day, projected to reach 6,513 by 2043. The structure is 364 ft (110.9 m) long and 68 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRiver RD
CrossesBlack Hawk Creek
LocationCity Bridge No. 29
RouteCity Street 0
CountyBlack Hawk County
StateIowa
Coordinates42.50594, -92.35769
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.5 US tons
Inventory rating25.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length364 ft (110.9 m)
Longest span82 ft (25 m)
Deck width68 ft (20.7 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,513 (2022)
Projected traffic6,513 by 2043
Trucks0%
Lanes on structure2
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was River RD over Black Hawk Creek built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2003.

What condition is River RD over Black Hawk Creek 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 River RD over Black Hawk Creek carry?

About 6,513 vehicles per day (2022 count).

How long is River RD over Black Hawk Creek?

The structure is 364 ft (110.9 m) long with a longest span of 82 ft (25 m) and a deck 68 ft wide.

Who owns River RD over Black Hawk Creek?

It is owned by the City or Municipal Highway Agency.