US Bridges

Ia 461 over Black Hawk Creek

Fair

Scott County, Iowa · 1.3 Mi. E of Iowa #22 · Structure no. 000000000046890

Built
1957
68 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
52 ft
3 main spans
Daily traffic
9,800
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 461 over Black Hawk Creek is a concrete continuous culvert carrying Ia 461 over Black Hawk Creek in Scott County, Iowa. It was built in 1957, so it is 68 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 9,800 vehicles a day, roughly 12% of them trucks, projected to reach 9,800 by 2043. The structure is 52 ft (15.9 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIa 461
CrossesBlack Hawk Creek
Location1.3 Mi. E of Iowa #22
RouteState Highway 461
CountyScott County
StateIowa
Coordinates41.50284, -90.61742
Functional classUrban Other Principal 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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating27 US tons
Inventory rating20 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 20
Structure length52 ft (15.9 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,800 (2022)
Projected traffic9,800 by 2043
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Ia 461 over Black Hawk Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Ia 461 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 September 2023.

How much traffic does Ia 461 over Black Hawk Creek carry?

About 9,800 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is Ia 461 over Black Hawk Creek?

The structure is 52 ft (15.9 m) long with a longest span of 18 ft (5.5 m).

Who owns Ia 461 over Black Hawk Creek?

It is owned by the State Highway Agency.