US Bridges

Niagara DR over Castle Hill Creek

Fair

Black Hawk County, Iowa · City Culvert No. 47C · Structure no. 000000000504070

Built
1986
39 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
684
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Niagara DR over Castle Hill Creek is a concrete culvert carrying Niagara DR over Castle Hill Creek 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 684 vehicles a day, projected to reach 684 by 2043. The structure is 26 ft (7.9 m) long and 39 ft wide.

Location

Open in Google Maps
CarriesNiagara DR
CrossesCastle Hill Creek
LocationCity Culvert No. 47C
RouteCity Street 0
CountyBlack Hawk County
StateIowa
Coordinates42.51604, -92.39794
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
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.3 US tons
Inventory rating30.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width39 ft (11.9 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic684 (2022)
Projected traffic684 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Niagara DR over Castle Hill Creek built?

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

What condition is Niagara DR over Castle Hill 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 Niagara DR over Castle Hill Creek carry?

About 684 vehicles per day (2022 count).

How long is Niagara DR over Castle Hill Creek?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 39 ft wide.

Who owns Niagara DR over Castle Hill Creek?

It is owned by the City or Municipal Highway Agency.