US Bridges

Blk Hk Rd-Falls over Black Hawk Creek

Fair

Black Hawk County, Iowa · City Bridge No. 10 · Structure no. 000000000011860

Built
1973
52 years old, rebuilt 1980
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
324 ft
4 main spans
Daily traffic
25
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Blk Hk Rd-Falls over Black Hawk Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying Blk Hk Rd-Falls over Black Hawk Creek in Black Hawk County, Iowa. It was built in 1973 and reconstructed in 1980, so it is 52 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 5 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 25 vehicles a day, projected to reach 25 by 2043. The structure is 324 ft (98.8 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesBlk Hk Rd-Falls
CrossesBlack Hawk Creek
LocationCity Bridge No. 10
RouteCity Street 0
StateIowa
Coordinates42.49774, -92.36241
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating29.4 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length324 ft (98.8 m)
Longest span81 ft (24.7 m)
Deck width44 ft (13.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2022)
Projected traffic25 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 Blk Hk Rd-Falls over Black Hawk Creek built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1980.

What condition is Blk Hk Rd-Falls 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 Blk Hk Rd-Falls over Black Hawk Creek carry?

About 25 vehicles per day (2022 count).

How long is Blk Hk Rd-Falls over Black Hawk Creek?

The structure is 324 ft (98.8 m) long with a longest span of 81 ft (24.7 m) and a deck 44 ft wide.

Who owns Blk Hk Rd-Falls over Black Hawk Creek?

It is owned by the City or Municipal Highway Agency.